Okay, after all the discussion, here it is. Filled. Sand is a bit deeper than I wanted. Between 2-3 inches. Was aiming for 2ish but didn't want to waste hte rest of the bag. Should I take some out or is it allright. I do want some gobies and other sand sifters but don't want poisonous gasses... Skimmer is off as I added instant ocean's bio spira and that was their instructions.