Actually I have a Emperor power filter with BioWheels that have saltwater bacteria on them. They have been floating in a 16 gallon saltwater tank that I have. They came from a previous saltwater tank that I had to break down. Re: Tank won’t support more than 2 fish 11/30/05 Thank you for the quick response. I confess I have not checked ammonia hours after introductions. You are correct in assuming I’m trying to add larger fish. I’m really trying for a Naso tang. I would like to add one other tang (Kole or hippo) for a total of two. Then fill out the tank with Anthias, Chromis, and other smaller fish. I plan to add my emperor last as I’ve grown rather attached and want everything to be perfect when he goes in. Can you give me suggestions to supplement my biological filtration to make adding fish easier