My tank has been running for 1 month, and after the initial struggles with microbubbles and tweeking the water level to get good surface skimming things were running smoothly. The skimmer never put out much, but I assume that was because of the newness and lack of load. Then yesterday, one of the powerheads started vibrating and when I turned it off the skimmer instantly put out loads of foam into the cup. Turn the powerhead back on and down went the foam then micro bubbles into the tank. I'm at a loss as to what to do. Any suggestions.