Quote:
Originally Posted by Myka
The gypsum board (drywall) will be fine. It helps holds houses up, so it should hold your tank up. 
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gysum/drywall does not have any real structural qualities its the 2x4/2x6 that hold your homes up. drywall will be the first thing to crack and tear apart with shifting you would get more stength from a 1/4 sheet of plywood than that of drywall. drywall is just an easier way to make nice looking cosmetic walls than the old plaster and lathe. not to mention nicer than wood panelling
but i do agree get rid of the osb bad bad bad. and overkill is always better than not enough. other than that it looks good. everyone has given you great advice.