I have three in a twenty gallon, goin pretty good, bunch of feeders in there breeding for another tank, the big cray gets a feeder every once in a while, i think he's challenged or something tho cuz I heard they are good at catchin fish.anywho I think you could pull it off if you go cray-zy with hiding spots( see what I did there with the "cray-zy" , nice) I used babyfood jars and rocks and gravel, as well as some pet store decor. probably like ten or more caves in there. all the crays seem chill, the big ones name is amos moses and the others names are two and three,booyah
