I'm not sure what is the best skimmer for me. I have a 33gal and the space behind the tank is very tight. Also, do these skimmers have to be above the tank inorder to work. Thanks again.
Sounds like the PRIZM,by red sea would be perfect for you.Although it does hang on the back of the tank,it only takes less than three inches.You could also hang it on the side if needed.This skimmer is cheap,and works very good on small setups...Look in the DRY GOODS page here at swfish to read more info,and order one.