I have 4' 75 gallon if you want to make a sump. ( there's no baffles etc in it ) It's a little rough, could only be used as a sump, but it holds water.
I also have a 3', I believe it's 33/35 gallon. It was the sump for a used tank I bought a couple of years ago. I never used it, it's just sitting in my basement. It was poorly built so you would have to redo it. ( the baffles etc, the tank itself holds water fine )
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Robb
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