I recently bought this preformed pond, but since it came used, and has such an odd shape, I have no way of figuring out its actual volume. A similarly-shaped product that I found holds about 87 gallons (according to Amazon.com).
I was hoping that somebody has seen/worked with this before, and knows how much water it holds? It's about 5' long by 4' wide. I'm a little concerned, because my dad wants to put a pair of adult RES in there (he firmly believes that even if it is 87 gallons, it has plenty of room for them for the rest of their lives). If all that ends up being the case, I'll give them to someone with better housing/husbandry skills.
Help!