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					Originally Posted by Nebthet  I have also found with it to eliminate the microbubbles, there is a sweet spot on the skimmer cup position with the O-ring. | 
	
 My bubble problem got worse the other day after I cleaned the collection cup. I didn't pay any real attention to the height as I don't get a heck of a lot of anythhing out of the skimmer yet. The odd burst of foam and then  nothing for a day or 2. Of course, I've only just put fish in it a couple of weeks ago so the load was pretty much nil.
I'll try lowering the cup height a bit and see how that goes.
The prefilter box isn't terrible expensive (~$35) but I'd like to try and make my own, for the heck of it.