Air bubbles coming up from live sand..what causes it?

[makofury]

Hey everyone, I added live rock and live sand in my tank about a week ago, the ammonia levels dropped on Sunday and now the nitrites are very high. On Sunday I also saw a diatom bloom, which now covers about half of the sand and on the acrylic of the lower 1/8 of the tank.
Today I noticed little airbubbles forming on the surace of the live sand, then expelled to the top of the tank. Any ideas as to why this happens? Also, when can I add a clean-up crew to help control this algae?
Thanks.
MakoFury

 

[nacl-h2o]

It's probably just nitrogen. This is what you want to happen. If your sandbed is deep enough it will probably continue and help control your nitrates.

 

[ruaround]

yup...just prolly the realease of nitrogen from the anarobic algea. Good sign.

 

[kev]

I have this same question. I know that its normal for the bubbles to come up, but my tank has been going for over 6 months. Its still bubbling like crazy, is it supposed to just bubble for the entire life of the tank?