I've been running my simplicity 120 dc on a cycling tank (dead rock/sand, dosing ammonium chloride), and before that I had run it in a vinegar bath for a couple hours.
I haven't been able to get my skimmer to skim enough bubbles to reach the cup. There are some bubbles, but they don't build up. The water level, even with the pump at full blast, only goes up half way into the skimmer body, and the bubbles don't build at all past that.
It could be my tank is just too new and has nothing to skim, but even so, shouldn't it be overflowing like crazy at least with all the adjustments at full blast?
I closed the bypass all the way, opened up the air as much as possible, the water level and bubbles are still very low.
Any thoughts?
I think it will take more time. From looking at the image, the body to super clean which tells me theres nothing to skim. You can always raise the water level a tiny bit to see if that helps, but I don't really see any darkness one the top of the bubbles, so I'd leave it for now