skimmer

Does anyone use one and are they worth the money?I only have an Emporer400 with 2 circulation pumps that I only turn on to circulate that poop that settles and to agitate the surface for a while. The current is too strong to leave on all day. There is a film of gunk that forms at the surface. Is...

My protein skimmer that I got for my Oceanic Biocube 14 is not bubbling...