So I got an old 150 gallon from a fish store. It's 72 long 24 deep and 20 high. It didn't come with a center brace. Got it all set up tonight and the front is bowing about 1/8 inch. I see some people say it's normal and some people say no way. Of course I didn't notice this until after everything was set up and my old tank was broken down. Huge deal or no? We plan on building a brace.