Hi Everyone. I just got done stirring/prodding my sand. One particular corner that tends to get neglected released a number of gas bubbles! Gas bubbles can build up under sand, which can kill bottom dwelling fish when they agitate the sand and release the bubbles themselves. I thought it would be a good reminder for everyone else with sand substrate to stir or poke it regularly, even in the hard to reach areas. :;th Cheers all!