I don't want to invest in a plywood build ..... can't really be moved and over time just wouldn't trust it..... if I could just find a stock tank that was 8x4x2....or 8x5x2.....I'd be happy
I knew a guy that kept rays for years in a Pearl of Paradise pond. It was 8'x30" I believe. He bred several varieties and I never heard of him having a leak issue.