I have a Seaclone 100, which I'm sure everybody is going to tell me to throw out, which works sometimes. What I mean is that there are times when for two or three days that the it collects that wonderful brown/green stuff but there are days when the froth/scum (what do you call it?) doesn't even reach the collection cup. It is in my sump and I thought it had to do with the water level but adjusting that doesn't seem to produce consistent results, I thought air regulation but that doesn't either. Does anybody own one of these and gets it to operate efficiently?