I have a 58g Oceanic reef ready system with sump. I have an ASM mini-G skimmer rated to 75g. I also use a filter bag with medium on the end of my down tube into the sump. I have eggcrate on the top of the aquarium, so I don't have a closed lid.
My problem is that no matter how clear the water looks, there is still "Stuff" that floats throughout the tank. I am nt sure if it is just dust and I should use a glass lid, or just stuff that the skimmer has not taken out. My skimmer works well. I need to clean the gunk out of it every couple of days, but I just feel that I shouldn't have stuff in the water. Would a canister filter help?