The center brace of my 55 just cracked off one side of the tank (its still secured on the other side). Is this catastrophic in terms of structural weakness?...do i need to go buy an upgrade tomorrow?
Mines been cracked for a couple weeks now. I just said the hell with it and haven't worried about it. I seemed like a flimsy plastic piece from the start.
Mine cracked in the middle, so I put some wood shims underneath it and then put 2 screws on each side of the break going through the wood and the plastic brace. I don't know if you have enough room to do that based on how you described yours though.
it was definitely bowing a significant amount since the cracked side of the brace wouldn't reach the side of the frame that its normally connected too.
I had a few that were repaired with a strip of plexiglass under the brace held in with stainless steel machine screws.I later replaced the broken tops with frames I got at the lfs for about $13 each.
Check you stand. If the tank is bowing; that means that the stand has either a high corner or little center support. If a stand is perfectly flat, then a center brace on a 55G is not that critical. However, if the tank is under a twisting force, or sagging in the center, the brace is the safety mechanism that helps keep the tank from splitting a seam or cracking.
Keep in mine that the stand may not be the cause, if your stand is on a wooden floor, the floor may have sagged over time. Plus if you live in a cold part of the world, the heating system lowers the humidity this time of year and that causes wood to shrink and/or twist.