Lion, you need to make up what kind of tank you want. Aggressive=loinfish+eel, etc. Little nemos just are not good choices for tanks with these big fish. A nice lion will eat him for lunch! Also, damsels and clowns are from the same family of fish. Are you experiencing aggression? Perhaps the supplier where you are getting your clowns has an illness effecting clownfish. Bottom line, decide what type of system you want and then make the system work. But you can't mix aggressive fish with reef fish.