Pristine water,lots of oxygen,lots of greens,Formula II, and a lot of luck. I think this is one of THE most difficult fish to keep; usually recommended for "experts" only. I hope you do well with this fish; but if he doesn't make it, don't beat yourself up...just learn and do research before you buy. Very few of us haven't made a big mistake or two; just don't make the same one twice. I don't know where you bought the fish; but if it was from a lfs, you should be able to trust them---but, very often, you can't.