I have a PSK-75 set up in my 10G sump that is under my 36 Gallon reef. I went to Hawaii for 6 days and left someone to feed the fish. The cup usually never got full in a week, and I had the level dialed down so the skim wasn't super clear so I wasn't concerned about them emptying it. When I got back the cup was full of clear skim and there was the remnants of an explosion from the cup overflowing and the skim inside going everywhere. I have had the skimmer for about 5 months and have cleaned it twice. I've never had this issue but lately I'll come check the skimmer and the cup will be full of clear water and the bubbles will be going crazy. I dial down the water level using the valve a bit and get the same result. Can you tell me what is going on here?