you have ugf...be very, very, and I mean super careful removing that thing...I sent my established 55gl into a cycle when we removed our ugf, but I didn't know to clean the cc. It's yucky, beyoung yucky under there.
And I mean you have to clean the cc, stay in one area, keep cleaning till the water is clean, move up and down, side to side, you really have to clean it...
but if you remove the cc with the ugf there....I would think that would screw up the ugf, but I'm not sure...