Logically, if the brace is actually carrying any load, it would be taut, correct, or at least more structurally sound? With it being as flexible as it is, when full, I really don't think it's carrying any load or that it is supporting any structure. This is a bow front tank remember, so it is likely different than a conventional rectangular tank. I'm not going to cut it off or anything, but it's just annoying for the reasons stated above.
Love your tanks and they will love you back