George Patterson wrote:
jthread wrote:

I did ask about adding more sand and they said that was an old remedy.
But it can release bubbles of nitrogen into the water.

And those bubbles will rise to the surface, burst, and release the
nitrogen into the air. Then it's out of your tank.

I think I'm missing a few posts, but I bet the person warning about the
bubbles was thinking Hydrogen Sulfide (HS) instead of nitrogen.