Do black Tiger Oscars change coloartion as they age? The O i have is becoming more and more grey as he gets bigger. The O is abouyt 4 inches atm. The fish store said the black coloration would come back once he was settled in the new tank and stress was gone. I do not think this is stressed induced. He also does not have much of the orange/red tiger "stripes" like most do I have seen. Did I get a poorly breed Oscar?