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The only times I ever see air bubbles on the sand bed is when a cyano bacteria bloom is about to start or denitrification bubbles. Do you have red slime on the sand bed that trap these bubbles or are they coming from under the sand? Denitrification bubbles are normal in a healty sand bed, but if its a coating bacteria like cyaon, you should look into some form of remedy.
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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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