- Joined
- Jan 18, 2017
- Messages
- 38
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- 29
I have tried everything I know but to no avail. My system is a 400 g with center overflow. the two drains are 1.5" with the returns being 1" each. Return pump is a Hammerhead/Barracuda gold hybrid. The sump is directly beneath the aquarium in the basement. The issue I'm having is microbubble from the drain. I have to valve down my return pump around 40% to reduce, not eliminate, the bubbles. I've increased the size of the hole in the 90 on the drain but didn't help. Any ideas what might be causing this?