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I can see how these designs would create bubbles. I think the size of bubbles could be adjusted by using a larger sized air line. (#3 above) This would make larger bubbles and thus rise out of the water faster.
I thought about trying a flapper style surge, but mechanical parts = more room for malfunction. The design used at Waikiki soesn't use any moving parts, so if I can get it working it should stay working.
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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
http://www.canreef.com/vbulletin/showthread.php?t=55041
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