Posted: Mon Jun 25, 2007 6:26 pm
Well, ideally, you would buy the largest tank you could afford. Turtles should have about 10 gallons/inch of shell, and this is especially important with multiple turtles because if they're cramped, there's a better chance that they'll become aggressive towards each other due to the stress.
Personally, I wouldn't go much smaller than 75 or 90 gallons, so that way you won't have to upgrade as quickly, and IF the turtles don't get along, you can most likely get away with their tank being the lifetime home for one of them, forcing you to only buy a second large tank for the other. If you go smaller and buy like a 30 or 50 gallon tank, it won't last nearly as long, and will definitely have to be upgraded soon-- turtles grow to roughly 4inches the first year, so it'd be cramped in a matter of months.
2 RES: Leo (f) and Ezra (m)
1 Russian Tortoise: Godzilla (m)