I didn’t put plywood on top of mine. Only the rim needs to be supported.It’s rimmed.
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I didn’t put plywood on top of mine. Only the rim needs to be supported.It’s rimmed.
Ideally, you'd want 7/8" Baltic Birch veneer-core plywood, but it may simply not be possible to obtain in a 4x8' sheet, which is what you'll need for a contiguous top. Baltic Birch is generally free of most defects such as knots, but it can be hard to source. Failing that, I'd strongly recommend getting veneer-core plywood - I'd be concerned that MDF core would creep under the weight of the tank.
By the way - you didn't mention whether this was a rimmed or rimless tank. I suspect rocket engineer's stand was designed for a rimmed tank; a rimless may require some cross-bracing in at least two places across the top to support the center of a rimless tank.
I was able to find top grade dry Doug Fir at Meek’s. Stuff is completely free of knots and perfectly straight. Ridiculously expensive at $8.45 a foot.
Your friend has shared a link to a Home Depot product they think you would be interested in seeing.
Will this work?
3/4 in. x 4 ft. x 8 ft. D-3 Special Birch
https://www.homedepot.com/p/304944323