What's the best way to quiet down the water going back into my sump? It sounds like mouth gorgoling. I drilled holes in the pvc to let more air in it but that never helped the problem.
Is it the actual overflow in the tank or where the water goes into the sump? If it's overflow, make some Durso stand pipes, if it's in the return of the sump, use some filter floss
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What type of stand pipe (where the water drains from the main tank) do you have? This is the problem. The drain in Tue sump is best left under water IMO