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Ok, so silicone is ok, but only once the pond armor is down. Got it. My reasoning for not wanting to fiberglass is pretty petty lol. While you have nightmare about failure, I would never be able to unsee the fiberglassing. There are some seams that I will have no choice but to fiberglass...

While my plywood structure will be glued and screwed, I would like to avoid having to fiberglass in my build. I know silicone doesn't bond well with wood for structural elements, but would a thick bead in the seams bond well enough to water seal? And if it can, is it ok to coat Pond Armor or...

Thanks for the info. They would be exposed to the humidity, but I don't foresee anything getting between there.

Will do. Glad you mentioned that!

The tank is 12' long, 26" wide, and 37" tall. They have various sizes ranging from about 3/4" to 2 inches. I would try and find some stainless bolts to anchor.

That was my intention. Anchoring about 4 of these as cross members, screwed into the 2x4s. Temp wouldnt change past 75-80 degrees. And if the tank for some reason was no longer running I could remove them easily to account for larger swings. Think that would work?

With my plywood build I will have 2x4 euro bracing along the sides, but instead of 2x4 cross supports, has anyone used aluminum flat bar? It should provide more strength than lumber as well as having a much smaller effect on blocking the lighting.

As for annealled, from my research I found it to be more common than tempered in these applications. Reason being that the strength isn't worth the catastrophic, no time to recover, blow out of a tempered tank. While the annealled is weaker, the crack should in theory give you some time to...

Thank you for the insite. Briefly checking online prices, 3/4 is almost double the price. May be easier to redesign the tank to be more shallow. It will be fully euro braced with multiple across the top braces which will help out the safety factor, but that height still isn't the best scenario.

I think a YouTube tutorial for your styro build process would be a hit. Looks great. Most styro builds I've seen don't look natural at all, but you nailed it.

I'm in the middle of a plywood build. 12 feet long, 35 high, 26 wide. The front will consist of 2 annealed panels, 66 long x 32 high. Initially, I planned for 1/2" glass. The glass will have 2 inches of bracing on all sides bringing my total viewing height of the glass to 28" tall. It seems...