I have a CSS65 and it's been running great for a little over two months that I've had my tank cycling. Now, it seems that it won't keep a proper level in the cup. I leave for half the day or wake up in the morning with the cup full to the brim or overflowing with almost pure water. So, I empty the cup, turn it back on and adjust the bubbles to produce dry foam. It runs just fine for a little bit, maybe even a day, then bam next time I look at it it's full with liquid. The only thing different from before is that I've done a water change, my cycle is over and I have some fish and a few frags. Anyone have this problem and know why it's doing this all of a sudden?