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 They really aren't the best skimmers IMO, but at the same time, you don't have a lot of bio load at all. I wouldn't be worried. I would however, throw that Prism away! I loath those skimmers lol. Never was able to keep one normally, I always had to adjust them every second day. 
 Have you tried to adjust it for more foam at the top of the cup?
 
				__________________  They call it addiction for a reason... |