Brown algea w/ bubbles rising

So i got this 75g seaclear tank 3 weeks ago.. It had about 35lbs live rock and a small amount of crushed coral.. I added 65lbs of dry rock and 90lbs of fine sand... I assume i am going through the cycle but i have brown algae which is normal but there are these bubble rising from the sand/algae only, not the brown algae on the rocks... there are lots of small bubbles rising all the time... what is this??? I am a newbie, tho this is my 2nd tank(had it 8 years ago).
Please help me if you can
nitrite is 10
nitrate is 0
ammonia is o

 

Welcome to 3 reef millerfoto
in 2 or 3 days it will stop
its just escaping gas

I remember when mine did that the bubbles where so big they where able to lift small grains of sand and then burst , so the sand drifted back down

nothing to worry about

Steve