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Air bubbles going into my sump

twiddledog

Non-member
I have a lot of air bubbles going into my sump from my tank. I have never seen this before and I am wondering what it means. Is something clogged? I can even hear it bubbling up. I have a 72 gallon All Glass with overflow. Should I worry about it?
 
Into your sump from the tank?

Are their air bubbles in the tank?

What is your setup like?
Pump? Sump volume?
 
Nope..tank looks fine.
 
I have a 72 gallon with a 20 gal refugium with protein skimmer. It has a duran return? not sure if i said that right. Could something be clogged?
 
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