I took it off permanently knowing I'd never use that filter on it again. Besides discovering the trick to restarting the filter (do the "maybe this will work" thing for 20 minutes), fish swim up into the open C-shaped part of the filter arm that slides on that mount. They die because they can't turn around. After it happened to us, we decided to deChi it.but I'll leave the filter holder piece because I don't know if I'll need it in the future.
That background looks really great! I have black posterboard on mine at the moment.The good thing is that since I painted the background with black, that piece is hardly noticeable (That was one of the reasons why I painted it in the first place).