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I'm cycling my first tank and I just plugged in my skimmer to try it out and I'm realizing I'm not quite sure how it's supposed to work. I see that when I adjust the pipe up the bubbles bubble up over into the cup and when I adjust the pipe down the bubbles go down and hang out just at the top without spilling over into the cup.
So which way is it supposed to be? Do I want the bubbles spilling over into the cup? Or not? TIA
So which way is it supposed to be? Do I want the bubbles spilling over into the cup? Or not? TIA


