As I said, this is kind of a dumb questions but since I don't know what to call this piece, I can't search the internet to find a new one. Basically, the piece I'm talking about is the plastic piece that attaches to a glass cover for a tank. You then cut slots or holes in it for your filter, heater and other things to go through. I am going to be changing filters (from 2 small to 1 larger one) on my 29 gallon so there will be too many holes left in the top of the tank if I don't buy a new piece.
