I don't think I want to drill the tank, you cant tell from the pics, but it doesn't have a cross brace and really thick glass to make up for the lack of brace, plus this would be the first time I ever attempted drilling glass and wouldn't want to ruin all my hard work, as for the filter sock, its already really quit and because my refugium is so long and there really isn't a lot of flow through there, bubbles don't make it very far, actually I dont really see any bubbles making it through the bubble trap, plus I just added 2 more baffles, one to help with bubbles, the other so I could add more water to the return side, Ill try to get pictures ASAP