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4 Things to Consider When Keeping Other Fish With Your Pet Crayfish

If you are going to have a pet crayfish, there are a few things you may want to consider. After having had a pet crayfish for almost three years, I learned several important things about caring for crayfish for pets.

Tank size issues

First of all, the size of the tank is going to be quite large if you plan to have a crayfish and other fish. On the one hand, crayfish are very dirty creatures. A crayfish can dirty a tank fairly quickly with the waste it produces. For this reason, I suggest at least a twenty gallon tank. Personally, I was able to keep my own crayfish in a ten-gallon tank. However, this required more frequent water changes in order to keep the tank fresh and clean.

In addition, a larger tank will provide more space for your crayfish and other fish. It’s good because crayfish are very territorial creatures.

Types of tank mates

Crayfish are aggressive creatures. They are omnivores who love nothing more than getting their hands on something and eating it. They have no problem eating other fish in your aquarium, plants and even other crayfish, if you have them.

So if you plan to have other fish in your aquarium with your pet crayfish, get some that are also aggressive. Fish that swim near the top of the tank and are fast work very well too.

Currently, I have minced fish and a red tailed shark in my twenty gallon tank with my blue crayfish. The red-tailed shark has lived with my pet crayfish for about two years. It worked very well because he too is aggressive, swims near the top of the tank and is a fast swimmer. It doesn’t mean that my crayfish don’t try to rip it out every now and then, it does.

Remember that slow-moving fish swimming near the bottom of the aquarium, where crayfish live, are very likely to be eaten. I lost a few fish at first because they were slow swimming fish.


In my experience, if I keep my crayfish well fed, they are not always as aggressive. Obviously, the more hungry a crayfish is, the more likely it is to try to track and catch your other fish. So keep your crayfish fed, but of course, don’t overfeed it.

Get a stash

Your crayfish needs a hiding place. Again, crayfish are territorial and like to have a place to dig. This is especially true and important when your crayfish molts. Because when a crayfish molts, it also becomes a target for the other creatures in the tank, because it is weak. The hiding places are inexpensive and can be purchased at any pet store. Or you can just make them from PVC pipes.

by Elvis Jackson Jr.

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