i just got a 4 inch rhom, threw him in w/ five little 2 inch danios. 2 days into the experiment he's getting his ass kicked. A couple of the Danios have little bites in their tails but the pirahna is missing most of his! Needless to say I am very dissapointed in him. Did I get a dud? Does anyone know how I can toughen him up? Maybe change his name to something meaner?