I recently broke down a 55 gallon reef tank. I had it on the same stand that you describe. Everything was fine. The only problem which I had with the 55 was with the cross bar. After about a year, the cross bar showed a small hairline fracture where it attaches to the front part of the top of the tank. This proceeded to get larger week after week. II spoke to a LFS about it and was told that this plastic fracture had little to do with the support of the tank anyway but talk about paranoid, I got rid of the tank. You should be all set with the bottom structural integrity from my experience.