Are you running a skimmer on your Nano?

[binford4000]

If I was you I'd go with a good HOG skimmer with a skim cup to help reduce the slick you have spoken of in the past.Also like stated the fuge is intended to be a safety net for not just the bugs but for bacteria also.The in sump skimmer will reduce these but not totaly destroy them.

[nate_newton]

No and no real filtration either. 24g pretty heavily stocked lps, 2 birdsnest, with a pair of clownfish, wc's every 3-4 weeks.