I have a tunze 9005 skimmer that is producing about 150-200 ml of skimmate a day. the skimmate is REALLY DARK and odorous (when I smell it). Is this a good amount for a 90 gallon tank. My bioload is pretty low right now. 3 fish small CUC and about 10 various corals. I am wondering if I have it set up and running effectively like it should? This is my first skimmer since I came from a 12 gallon all in one so I have no experience with them.