What Types of Hermit Crabs Should Be Placed in a Saltwater Aquariums?

Hermit crabs have been popular pets for adults and children alike for many years, and there are many who appreciate their unique beauty (and just as many do not-it's a matter of taste). With the increasing popularity of bringing a piece of the sea into the home it is no wonder that the notion of introducing hermit crabs into a saltwater aquarium has been gaining in popularity.

Just as there are many types of hermit crabs that can be kept as pets, so too are there many different breeds which can be kept in aquariums. Not all have the same chance for survival if kept in captivity, however, and it is important that the aquarium owner make sure that they are familiar with all of the specific needs of their hermit crabs before they are introduced to the aquarium. Below is an introduction to some of the most common breeds of aquarium hermit crabs.

Red Hermit Crab (Dardanus megistos)

- Red Hermit Crab (Dardanus megistos)- Also known as the White Spotted Hermit Crab this crab has red legs with black edged spots. It is not a safe addition to a reef aquarium but is very useful in keeping algae growth to a minimum in a community aquarium. Only one crab per aquarium please; these crabs are very protective of their personal space. 

Credit:Hermit crab, Dardanus megistos, SegarA4854 - Reefimages & Introduction to Ocean Sciences

Red Tip Hermit Crab - Clibanarius digueti (aquariumdepot.ca)

- Red Legged Hermit Crab (Clibanarius digueti)-these Mexican crabs are a hardy addition to any aquarium, eating algae from the tank. They demand a low level of copper in the water, however, as their bodies cannot survive in the presence of this metal.

Scarlet Reef Hermit Crab - Fragbox Corals

- Scarlet Hermit Crab, or Reef Hermit Crab (Paguristes cadenati)-this hermit crab generally remains small, around two inches across, and has a red body with yellow eyestalks. They are very helpful in keeping the algae growth inside the aquarium under control; however, if insufficient algae is available inside the tank they must be supplementally fed with dried seaweed. 

Common Hermit Crab (Pagurus bernhardus) 

- Common Hermit Crab (Pagurus bernhardus)-These crabs are more common in Europe but can be found in other countries as well. Also known as the soldier crab. ( Photo: Hans Hillewaert) 

Since these crabs carry their homes around on their backs it is important that they constantly have new shells available to them when they have outgrown their previous shell. A hermit crab in an improperly sized shell cannot grow properly. These shells can be purchased from a pet store or an online retailer or, if the owner is familiar with the requirements of their hermit crabs, these shells can often be found on a beach. If the owner chooses to go out into the wild and collect their own shells it is important that they choose the proper type of shell for their hermit crab to inhabit. As sea anemones are often an important part of the hermit crabs natural environment they make excellent tank mates, eating the leftovers when the hermit crab has finished a meal and cutting back on the amount of tank waste. 

Hermit crabs are an intiguing addition to any tank, and require very little maintenance once their owners are familiar with their needs and their habits. With the proper care they can live for quite a while, providing endless hours of joy for their owners and their families. 

Buying Guide -The 5 types of Aquariums

You might wonder about what type of aquarium to buy, first of all.
let me help you a bit, before you buy anything.

Saltwater aquariums should generally contain fewer fish than fresh water tanks, because the species usually tend to grow bigger in size. Marine species may be bred in a captive environment, or caught in the wild. Captive bred species are easier to care for and usually hardier than caught species. It generates a great amount of stress for a fish to be captured in the wild and then introduced into an aquarium environment. It is often difficult for them to figure out how to eat. Whenever possible, purchase your fish from a retailer that deals only with breeders or from the breeders themselves.

There are basically five different types of saltwater aquariums.

The first type of saltwater aquarium is the fish only aquarium. This is probably the easiest to care for of the five types, simply because you are only dealing with one type of species. Amongst the saltwater fish there are both tropical and coldwater types. They can't be kept together for obvious reasons. The water temperatures vary greatly. Tropical fish are usually brighter in color, and therefore more appealing to aquarium lovers than the fish available in the cold water variety. Most people are somewhat familiar with a few tropical fish such as the Clownfish or the Angel fish. However, few people have heard of such cold water varieties as, the Shanny or the Tompot Blenny.

The second type of saltwater aquarium is the invertebrate only aquarium. These types of aquariums usually consist of shrimp, prawn, hermit crabs and perhaps even starfish or sea cucumbers.

The third type is the fish and invertebrate saltwater aquarium. These are more difficult to maintain than either of the two categories separately. Certain invertebrates feed on certain fish, and the reverse is also true. Therefore, it is important to research the species carefully to ensure that you do not put predator and prey together in the same aquarium. Diseases can also spread more rapidly and are more difficult to prevent and cure in aquariums containing both invertebrates and fish species.

The next type of saltwater aquarium is the coral reef aquarium. Reef aquariums can be tricky to maintain and must be thoroughly researched before attempted.

The last category of saltwater aquariums is the specialty aquarium. An example of a specialty aquarium would be an aquarium full of sea horses. Sea horses should not be kept with any other type of fish or marine life, because they are timid and slow eaters. Their food source could easily be taken away by other tank mates. Seahorses prefer to swim vertically rather than horizontally, and should be placed in a tall tank. An octopus and a shark or a ray are other examples of fish that require special needs and would fall into the category of specialty aquarium.

Regardless of which type of saltwater aquarium is chosen, research is highly recommended before purchasing any marine life. Make sure you are willing to make the commitment required to care for a saltwater aquarium.

Check out the other posts in our blog.

The Easiest Way to Setup a Saltwater Aquarium: Part One

Establishing the Basic Needs of the Tank

Everyone has admired the large saltwater aquariums that can be found in the offices of most dentists, physicians, cosmetologists and marine enthusiasts but have believed them to be far too much work to bring into their own homes. Fortunately, this is not the case. While the process of establishing a saltwater aquarium can be a costly one, in terms of manual labor there is a very simple method which almost guarantees success.

Step 1: Assemble and prepare the equipment. During packaging and production the aquarium and all of its corresponding parts have almost certainly been exposed to various pollutants, such as dust and chemicals, which will be very harmful to the fish if it is allowed free reign in the aquarium. Prior to use every piece of the aquarium should be washed with hot, fresh water and cleansed with a soft piece of cloth to prevent scratching.

Step 2: Place all of the components in the tank WITHOUT adding any of the decorative features. Then fill the tank to the fill line (which may or may not be already marked on the aquarium-2 to 3 inches from the top is generally adequate to prevent major spillover when the tank is cleaned or the fish fed) with saltwater (if you have chosen to make your own saltwater solution read below for instructions). Turn the tank on and allow it to run for 24 hours to ensure that all components are fully functional.

- Making Your Own Saltwater -

Ocean water is the natural habitat of all saltwater marine animals and, consequently, the best water source for any saltwater aquarium. If ocean water is not available, however, and the owner of a saltwater aquarium does not wish to purchase a pre-made saltwater solution it is possible to make saltwater. It is important to use a sea salt mixture that is free of impurities rather than table salt when creating saltwater in order to reproduce the natural environment as accurately as possible. These mixes can be purchased from any store that specializes in the sale of tropical fish.

Step 3: Landscape your aquarium. Organic substances are not only more aesthetically pleasing than their plastic counterparts, they provide a more pleasing environment for the fish as well. Keeping in mind that fish generally use what humans consider to be decorations as shelter when in the wild it is important to consider the types of fish which will be inhabiting the tank prior to choosing its decoration.

Step 4: Start the 30 day cycling process, during which the ammonia should be tested regularly. This can be done with or without fish in the tank.

Following these simple steps will allow the amateur marine enthusiast to place aside their fears and enjoy the benefits of a happy, healthy aquarium in the privacy of their own home.

How to care about an invertebrate Marine Aquarium

Marine Aquarium Care- Invertebrates Only

The care required for an invertebrate only tank is very similar to that of any other saltwater tank; however, the invertebrates are far less hardy than fish.  It is recommended that you become skilled with a fish only tank before attempting an Invertebrate aquarium.  Most Invertebrates require a specialized diet. Check with the supplier before purchasing and be sure that you are willing to make the commitment to have food delivered if necessary.  There are two different types of invertebrates, tropical and cold water.  Make sure that the type you are buy is compatible with its other tank mates.

A few examples of tropical invertebrates are tubeworms, red hermit crabs, cleaner shrimp and the sea apple. All of this marine life is compatible in terms of water conditions.  They require a water temperature between seventy five and seventy nine degrees Fahrenheit, a P.H. between 8.2 and 8.4 and a salinity content of 1.020-1.024.  As you can see, there is very little wiggle room associated with these measurements.  It is extremely important to check the levels daily, or the results could be costly.  These invertebrates are not compatible, however, with their food source needs.  Check with the supplier for compatibility before combining tropical invertebrates.        

 Unlike their tropical counter parts, cold water invertebrates are usually not sold in stores.  They have to be collected from tide pools.  It is important to make sure that these species are not on the endangered species list before removing them from their home. It is equally important to do research in order to verify that you are able to properly feed them and care for their very specific needs.  Sea Anemones, prawns, shrimp, and starfishes are a few varieties that have been successfully maintained in an aquarium.  They require a water temperature between fifty four and fifty nine degrees Fahrenheit, a P.H. between 8-8.4 and a salinity content of 1.024-1.025.  Luckily they do eat the same food.  They feed off of a diet of small pieces of raw fish, shrimp, squid and mussels.

When keeping cold water invertebrates such as the species mention above, it is a good idea to keep a separate tank full of shrimp, mussels, and scallops to be used as a food source, if you wish to use fresh rather than frozen foods.   Be careful when keeping shrimp, as all of the invertebrates listed above feed on shrimp, including shrimp themselves.  It is unlikely, however that a healthy live shrimp will be eaten whole by another shrimp or starfish.  Invertebrates should be fed more frequently in smaller amounts than fish. Try to feed only an amount that can be consumed in the first thirty to sixty seconds.        

When setting up an invertebrate tank remember to include live rock, because some invertebrates feed on the parasites that grow on the live rock.  A substrate should also be included in this type of aquarium. It will provide a place for the crabs and shrimp to dig and bury themselves.  A light should be included as well, if you intend to keep anemones.  

Before Stocking Your Saltwater Aquarium With Tropical Fish

When most people look at a saltwater aquarium the first thing they notice are the fish.
Fish of all shapes, sizes, colors, styles, and personalities. One of the most devastating things that can happen to a tropical fish lover after they have gone to the effort and expense of purchasing an aquarium and setting it up is to purchase fish that are riddled with disease that die shortly after they are brought to their new home.

The odds of purchasing a healthy fish is by purchasing it from a reputable pet store.
If you walk into a store that sells pet fish for private aquariums and your immediately flattened by the odor of rotting seafood turn around and walk away. It isn't unusual for fish stores to have a peculiar musty scent. Strong odor can indicate a store who is not as concerned as they should be about the care of their animals.

Take a good look at the store's aquariums. The tanks should be clean. The water should be clear. Don't be alarmed if you see a tank that has a sign announcing that the fish in the tank aren't for sale. Many fish stores don't have enough room for a quarantine tank.

The staff should be friendly, attentive, helpful and informative. If the store is having a slow spell the employees should be cleaning tanks or feeding fish. When they catch a fish, the professional handler should use two nets and corner the fish, eliminating unnecessary stress.

The rule of thumb is that if there are more then three dead fish in a tank consider shopping somewhere else. Dead fish happen. When stores are busy they don't always have the time to clean the deceased fish from the tank. So one or two is not necessarily a bad omen, but more then that and you'll want to consider looking somewhere else before you stock your saltwater aquarium.

When you are shopping for tropical fish take your time and really study the fish. Take note of their physical condition. Study their eyes, fins, mouths, scales, and abdomens. Put your hand as close to the glass as you can without actually touching it. The fish should either swim towards your hand, looking for food, or they should dart for cover. If a fish doesn't look or act healthy, don't purchase it.

Before you go shopping for tropical fish, gather a little knowledge. Make sure that the fish you purchase are compatible. Make sure you know what kind of food they require (predatory fish generally need frozen or live bait). If you decide that you want to own a predatory fish that requires live food make sure that you have a way of keeping that food alive, in many cases this will mean a completely separate tank. If you are eventually planning adding coral to your saltwater aquarium you may want to start thinking ahead and purchase fish that are compatible with coral.