I agree and disagree. I've had a white cray for a year now. When he was young he eat a lot of the plants in my 75. Later I got dollars so couldn't tell if he eat much of them after that but he's seemed to slow down on plants. He's molted 5 times and by the 4th molt (9months old) he had calmed down a lot. He used to run around and hunt more. Now he only leaves his cave on occasion or at night. He's never eaten any fish that I've know of. I have him in a 75 with 4 dollars, 5 discus, 15 cherry barbs, 1 angle, 1 red tail chelsius, 2 hatchets, and a few bush nose plecos. I personally feel if you feed them enough and give them ample hiding spots they can be kept with fish.