Yeah I feel the same way. It has to be a risk on some level. I'm just going to wait until I can get a nice piece of plywood. Silicone is still curing anyway.
Plywood is always better than OSB. But I dont see why it wouldn't work. They build houses out of the junk lol.
The stuff doesnt like water. Make sure you paint it
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I had a 100 gallon metal frame years ago that I stuck in a closet with a pair of 2x4's under it. Loved that tank and would still have it if my brother hadn't gotten divorced. That is a painful tale of woe!