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To solve your problem. Get rid of the check valve for starters, they do reduce your flow as stated above. You can drill a 1/8 or 1/4 inch hole near the top of the return tube/pipe just under the water. When the power goes out and the level drops by an inch the siphone will break because of that hole.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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