I also had a few problems with BM200 also because I didn't have an ATO. Once I had the sump water level constant the skimmer really started working great.By finicky....
This skimmer forced me to do something that I'd been meaning to do forever which was adding an ATO unit. If the level in the sump varies "too much" the skimmer will act up. It's all good though. From a turbofloater 1000, to 2 different euroreefs to the BM250 it's one that I'm going to stick with for now.
Oh yeah, I forgot a couple of Aqua skimmers in there too.
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