Denitrification in the sandbed

[Shilpan]

So my sand bed is about 1-2 inches (depth varies).

I notice right before water changes there are always lots of microbubbles on the sand. These disappear for a week or so after siphoning and then return. Is this evidence of denitrifying bacteria? And if so, are there any benefits to leaving them alone? Or in the long run will the build up of detritus be far more detrimental?

Cheers, I do notice these bubbles on my rocks too. These are all over my refugium but I assume this must be oxygen.

 

[florida joe]

unless you have a plenum, I dont think your sand bed is giving you any denitrification. are there bubbles in your sump and or refug

 

[2quills]

Pearling probably.

 

[deejeff0442]

Only time I see bubbles like that is when I get an algae bloom .