they are sort of micro bubbles, i can only see them when i am super close to the tank, they are like clear/off white in color, my filter is rated for 160 gallons, so double, I am also getting another marineland penguin 350 for extra flow.
definitely not over feeding, even when i dig into the substrate all the way down(3"-4"), there is no dirt coming up, so not dirt, maybe something else, IDK what it is, but I have never seen it before. I feed once to twice a day and skip a day each week of feeding.
I will get pics soon, but it really looks weird.