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1 and 1/2'' by 1 and 1/2'' angle with self tapping screws in about 4 places should do it with coroplastic along with some treated 2x4's between the angle and coroplastic under the gray and black tanks. This way you take out some of the sag and reinforce your tanks at the same time.A couple of hours and you are done. If you don't like 1 and 1/2'' then use 2x2 angle.Been there and done that and don't have to do it again.
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