So I still don't know...

I have the stand mostly built and have 1/2" room (so that it will be hidden by the side panels and doors) for either foam or plywood. I am leaning towards plywood just plywood under the tank but anymore advice?

jeez...
I'm in the middle of setting up a 95 that is flat glass with no trim on the bottom.
The glass sits flush on the stand (which is custom made out of very good wood and flat/even as can be).

what should I do?

Right now, as the guy who had it before me had 100 lbs of LR on it with no issues for 6 years, I don't hink I'm going to use foam.

But if anyone here can save me from myself, please do so.

If there is No trim, then I would suggest foam. The foam helps for even specks of dirt, uneven grains in the wood, etc. think what would happen if you set your tank on a tiny pebble?? Major pinpoint pressure

Maybe...
I'll consider now.

I suppose it's just like insulators foam I would use?

Yes, rona has it. But do use something. Hate to see the worst happen.

the foam is strong in this one obi one use the foam lol I neeeeedddd timmies