I have three tanks; 125 gallon community tank (with all kinds of species), 35 gallon cichlid tank (still pretty small guys) and a 10 gallon that had one large mean aggressive Cichlid that I did not know what to do with since he does not play well with others. I bought a large blue cray this weekend to make my 10 gallon tank more interesting since I can't put anything with the mean Cichlid at the advice of pet store that blue cray don't need much roaming room, but now am thinking he may have been wrong. I thought of moving him to the Cichlid tank, but worry they may be too small yet and he will eat them. Right now, he rarely if ever moves from under his hallowed out log which does confirm what pet store said, but I want him to do well and thrive since he was pretty pricey and I and my 4 year old twin boys rather love him.