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Thanks for the response. I got set up with a check valve and tried turning off the air supply. No siphon :) But still, I feel I need more checks in place cause when things go wrong... they really go...

So I just got an upflow algae scrubber, but forgot to take into account what would happen if power cuts out, and causes water to flow back through the air hose into the air pump.

I'm not too...