I normally see Rubbermaid stock tanks being used as the gold standard for temporary marine livestock holding, though I don’t see any reason why one of these liner and frame containers wouldn’t work!
The primary concerns would be a tear or puncture in the tarp-like material, or damage/failure of a framing component! (You wouldn’t be able to add bulkheads to this container to run a sump either, but that’s secondary!)
— it’s definitely an attractive option for the price! Does the waterproof tarp-like sheet have a listed thickness, or material(s) of composition?