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I only have a handful of Chaeto in the sump. There is plenty of room for more, do I need more?
If my lighting is on the lower side in my sump will that cause part of the problem. I have a 72g BF with a 30g sump, about ten pounds of live rock rubble in the sump along with about 5 and a half inches of live sand and the Chaeto. In the main tank is about 80 to a 100 pounds of live rock, and a three inch live sand bed. I get a pretty decent skim on my skimmer. But I am still at about 20 PPM on nitrates!!!