I have a DIY Skimmer that has been producing about a cup of pretty dark skimmate every 4 days or so in my 180 gal. I wasn't sure if it was skimming all it could be, so added another skimmer (Same design) and ran if for a couple weeks. I noticed my first skimmer dripped its production probably in half and the new one wasn't producing all that much. I took the second one off line and the first one is producing back to normal. Would this mean my first skimmer is skimming most everything that could be skimmed? Anyone try two skimmers with success?