the rule of inch of fish per 5 gallons is a good one to follow, but it depends on the kind of fish you have and the bioload. if you have any kind of aggressive carnivores, ie groupers, etc, the bioload will be heavy, so you dont want alot of fish, but if you have relatively small fish, ie gobies, clowns, pygmy angels, then you could have a few more. just watch your water conditions and go slowly about adding fish, otherwise you will learn the hard way when your system crashes from overload. hth <img src="graemlins//silly.gif" border="0" alt="[silly]" />