I'm with Fernzpat -- please tell us what equipment you have in this tank!
I'm thinking about starting a 7 or 10 gallon nano reef. I still have a lot of research to do, but this would let me know what equipment I need to get. Then I could read about the equipment to understand how it all works.
How does the clown do in there? My Drs. Foster Smith catalog says they should be in a 30 gallon tank. But I have seen other smaller nano reefs that have a clownfish. Is it a percula or an ocellaris?