Ok so just a few quick questions as this is my first skimmer. 1. Are skimmers in general meant to always have the foam at the top of the neck or just when there is something to skim? For example when you clean green algae off your glass. 2. Does it matter how deep in the water they sit or is it just a matter of adjusting them to your desired skim rate? 3. Is it better to see large/med bubbles coming out or small bubbles like a frothy foam? Here are some pics ...
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