clownfish aggression... any way to reduce it?

[Wayne]

With a 33G the clowns are going to consider the whole tank as there territory. Basically you should either remove some OR get a bigger tank

More hiding places and more hosting corals will help with the aggression but is not a long term solution. I really don't think more fish is the right additude. IMO thats just stressful to everything in the tank and the person watching it.