L Shape plywood tank

[Crob5965]

So I finally decided to try building a plywood tank, I wasn’t looking to go big enough to justify the cost so I decided to try and build something different to make it worth my while.
My wife suggested that I build an L shape shallow reef so here it is


 
Tank is approx 75 gallons
48 x 16 x 14
 
 
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[Crob5965]

Not having a top brace made me very nervous, especially as there was little to no other plywood tanks similar online that I could reference so I had to just use my best judgment and pray it held water.
After 48hrs of holding water I’m going to drill the return and overflows today and re apply 1 more coat for good measure.
I will be placing a 3/4” return in the back corner with Dual loc line sprayers and 1” overflows on each end.
This was originally going to be a frag tank under my stairs but I’m leaning towards turning it into a shallow reef somewhere in the house if I can find space


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[AlanM]

Neat.  What glass did you use and what did you use to seal the wood?  Seems like if it was tall you'd need top braces, but might not if it's a shallow one.

[Crob5965]

1/4” glass, agreed it’s only 14” tall
There’s really no calculator out there for anything other than a rectangular plywood tank so I played around and found that 1/4” glass was recommended until you went over several hundred gallons. That being said they were using a top brace and no corner seam.
Bottom line I had 1/4” glass so decided to give it a shot, my original plan was to have the “ picture frame brace around the glass, but I decided to try it without 1st.
Tank is drained now but held up no problem for 48hrs.
Once bulkheads are installed I’ll fill it up again for a few days to be sure.

I used liquid rubber with geo textile fabric to waterproof the tank


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