Got a used 92g cube recently. Guy says it's made by marineland but I've looked everywhere and have not found the style I have. Main thing I'm curious about is the black trim piece on the bottom. Any rimmed tank I've seen has a top and bottom rim but yet the one I have only has a bottom rim. Guy I got it from only said it had the bottom rim when he got it. It's real thin, flimsy, and separating from the tank in a few places. Wondering if I should replace it, or take it off, or leave it. Any guidance would be appreciated.