I recently bought this Curve 5 Skimmer from Ng yesterday. As soon as i went home, i set it up and run the skimmer in my sump. It was skimming normally and produced nice foam for the past 12 hours. After that it starts to overflow and fill up the cup. I switched off the skimmer, took the cup out and empty it.
By the time i put it back and turn the skimmer back on, i can see that the water level inside the skimmer is not constant. It goes up and down. I tried to play around with the adjust tube to no avail. So i took everything apart and clean it, including the pump.
After assembling it back together, the skimmer still performs abnormally. The water will not stay on the level i adjusted. It will go up and down the entire hour.
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Is this normal for a new skimmer? If not, should i return it back?