Errr, I hate to say it but I think you should have definitely done research on the ID shark before you bought it. I can't believe those things are still sold at LFSs, sick people! Housing that ID Shark is just going to be tough. I mean if you could keep up with moving it into larger homes as he grows I guess it's okay, it might hurt his health and growth rate though. All the tankmates you named with your ID shark will be feeder fish when he his mouth becomes big enough to stuff them. Pretty much all fish that don't grow to his size will be. =-\ don't really know what to tell ya, I would return or get rid of the ID shark in some safe, ethical manner though~