I've got 7 crayfish in 20 g Long tanks, 30 g tanks & 47 g tanks. Each tank has fish in it with the cray. I've got P.clarkiis, C. quad, C. peknyi & C.destructor crays. I've never had a cray eat a fish (knock on wood). In the different cray tanks there's gold and blue gouramis, Dwarf Gouramis, Black Phantom Tetras, Tiger Barbs, Danios, Hatchets, Serpae Tetras & Red Eye Tetras. I just figured the crays left the fish alone because they got more than enough to eat and just weren't hungry enough to hunt fish. The Blue & Gold Gouramis even snatch food away from the big C.quad. Bold fish!
