Originally Posted by Brookster123
I'd do all the adjusting prior filling tank, check again every 30 gallons for sagging.
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I agree with brook adjust before hand. What you could do is put in cross braces in between the joists using hangers then frame in some 4x4s mounted to the bottom side of the joists followed by pier blocks with 4x4s vertically for a tight snug fit that should help. Is your tank perpindicular to your joists as well?
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