I wonder if I should try this on mine. I am getting a new 90 gallon tank with a 40 breeder custom sump up and going with a Nyos Quantum 160 skimmer and all it does is over flow. I didn't know if this part of the break-in or what, so i was going to let it run for a few days, but I can't really tell if it's getting better or not. I have the skimmer turned all the way down as for as water level, air, ext. It's in 8 1/2" water, which is the recommended height.How about running it in vinegar for a day or 2. I couldn't get mine adjusted out of the box and had to do this before I could come close to getting it set up. Otherwise it did nothing but overflow.