They need water temperatures that stay between 22 – 27°C (~70°F – 80°F) at all times, with no drastic jumps from high to low ends. Learn how to create a happy, healthy home for your pet. The species will determine your crab's diet, environment and appropriate tank mates. This is the reason they are sometimes known as Mini crabs. Vegetables like spinach, peas, squash, leafy greens, etc.As you can see, they will eat pretty much anything!Do not forget that variety in food is always better because they will get different microelements necessary for them.When you decide to give Red claw crabs vegetables, you need to do it the safe way. They make small dens under aquarium decorations and plants, and will readily retreat to these caves if overly threatened, or scared. Learning the dietary, environmental and social needs and restrictions of the most commonly kept freshwater crabs will give you a solid starting place for crab stewardship -- but you must also thoroughly research your individual crab's species before bringing him home. It replicates their natural environment. Check on the crab from time to time by looking at it, but don't pick it up or try to help it with its molt. The largest stone crab claw collected by the FWRI researchers was 148.9 mm (5 3/4 inches). Be aware these changes in behavior and appearance that signal that your hermit crab is getting ready to molt: They can be extremely aggressive towards each other. The final zoeal stage is about 1.0 mm in width (Hopkins, Rogers 1944). Red claw crabs are territorial and very aggressive to each other. This is very important especially if you have two of them. While they are mistaken for freshwater crabs and they can survive in freshwater, they do their best in brackish water. I know these things molt, but how long does it usually take? Of course, I know that some people manage to keep them even without a filter. After molting it will take a while for your Red claw crab’s new skeleton to fully harden. It seems like somebody said it once and now almost everybody repeats this nonsense.In reality, there is another explanation. It is good to know when a molt is imminent so you don't disturb your pet during this stressful time. The red claw crab should live in a 10-gallon tank with a few resting places, such as long pieces of wood, along the water level to give him the opportunity to crawl out. It will then begin to remove itself from the old shell.

A rainbow crab needs a 50/50 split of land and water in his aquarium, a secure top to hinder escape, a hiding place and a temperature between 75 and 85 degrees Fahrenheit.

They will fight over territory and oftentimes the outcomes are deadly.

There’s quite a number of LPS corals in the reef keeping hobby but today’s topic of interest is the Hammer coral (Euphyllia Ancora and Euphyllia Paraancora). The largest female claws are about 120 mm (4¾ inches). This crab can be kept in freshwater, but he will thrive much better in brackish water with specific gravity of around 1.005 and temperatures between 75 and 80 degrees Fahrenheit. This can be an amusing sight to watch as they scurry along, searching the bottom for food. Molting Timetable The time it takes for a crab to complete a molt varies.
In contrast, females will have smaller (about half that size), darker claws and their underside will be rounded (wider and oval). These crabs are not social. Hard as it is to not know what is going on with your crab once it has buried itself, it's best to leave a hermit crab alone and let nature take its course during molting. With both sexes the time between molts (instar) grows progressively longer ranging from 10 to 15 days for one-inchers to 30 to 50 days for legal hard-crab catch size and beyond. A rainbow crab can thrive in freshwater unless raised in brackish water -- he'll need to stay in that; the change can be fatal. This is the reason they are sometimes known as Mini crabs. From what little Red Claw Crab care information I could find on the internet, it seems that they are actually brackish crabs. A hermit crab may take up to two months to complete the entire molting process, so you will know far before that time whether or not they are still alive—and smaller crabs do not take nearly this long to complete the entire molting process.