I have a 12g standalone fuge with a slotted PVC return (redneck skimmed overflow) back to my sump return side. It's fed by about 50gph from my return manifold and a K-nano for a little circulation. 6700k PC lighting reverse from my display so it runs about 14 hours a day. Running barebottom with a big ball of chaeto. After 1.5 months of being up.....it's gotten pretty nasty with film algae and little tufts on the acrylic. DO you guys/gals ever clean your fuge. SHould I add a small algae eating CUC (turbos, astreas, ceriths, etc.).