finally fixed my bowing issues by cutting 2x4's to the correct height of the front of the tank and cutting half of the angle on the front frame to relieve the stress. I'm very happy with the results, the bottom is only .25'' off in the center instead of 1'' and i can live with that. The top is now level all the way across without the 2x4's. Also fixed the bottom strap supports and added more pieces where the polypropelene seams meet. more pics coming soon.....