I have the exact same tank and stand. first off, you cannot slide any sump tank either form the front or the back. The only option is from the top. I used a 20 long as my sump and was able to slide it from the top. Since you have 29 which is taller you have no other option but to remove the center brace and replace it after the tank is place. Or go buy a 20 long tank and make that a sump.