If theyre chep or peco pallets I still believe theyll hold just fine but go with your gut.
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^^^^agreedMy thoughts are if you're going for a ply build you might as well make it 8x4' to use a full sheet...
Oh man, this will be great to see because I'm planning on building exactly the same sized tank in December
I would go w/the 7x3x3 plywood. Moooooaaar gallonsand still cheaper.