How long have you had it running? Mine initially had a few micro bubbles and random overflows but I changed the depth to just under 7" and lowered the power settings. It now runs in my sump with no bubble trap and there's no problems of any kind.
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20 year old Hagen 100g 6' mixed reef. 36g sump with multiple broken Waveline products removed. Lights T5-LED combo.
1 Coral Beauty, 1 Flame, 1 Blue Tang, 5 Green Chromis, 2 Pajama Cardinals, Asst'd hermits & snails.
2 large boxes of broken expensive aquarium crap. 1 x VERY understanding wife.
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