I put this in my new 6.5 gallon tank and it either picked up water quickly or didn't pick up at all. But after about a week when my aquarium started to work I noticed that bubbles were forming and it was working as it should! I held mine where there was no water in the cup until it started working, which meant the whole cup and part of the hose was sticking out of the water. Perfect for my aquarium compared to some other skimmers I've seen! If you had the same problem, just give it time!
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