Prizm skimmer question
This for anyone out there who has or has used the prizm skimmer. I just put one on my 20 gallon long tank and I know it needs a break in period. My question is where in the reaction chamber should I try to keep the water line? The manual says just below the o-ring. Is this the bottom o-ring where the collection cup attaches or the upper one just where the funnel of the reaction chamber starts? Thanks for any help, this is my first skimmer ever.