Posted: Tue Jun 28, 2016 7:38 pm Re: Turtles attacking each other - how to separate!!
I'd say they need to be separated. Years ago, one of my turtles started bullying the other, and I thought I could keep the peace by feeding them separately and upgrading their tank, but it wasn't enough (but to be fair, the tank was still small--a huge upgrade might have turned out differently, but I doubt it). Eventually, the bullied one attacked the bully and drew blood, much more vicious than the bully had ever been (but for understandable reasons); after that, I re-homed one to a friend's koi pond. (That turned out to be a bad idea--the family member that maintained the pond somehow didn't realize that the turtle was small enough to get caught in the filter, and he died. That doesn't mean you shouldn't re-home one turtle, but it DOES mean you should check their setup thoroughly, and don't take for granted that they will know how to keep your turtle safe! I still feel guilty about that today.)
While you save up for a much larger tank or make other arrangements, perhaps you should get a small new setup going, and then rotate them: one turtle could be in the permanent tank one day, and then the other could be in the permanent tank the next day. That second temporary tank would still have to be adequately filled, filtered, temperature-regulated, escape-proof, all that stuff--but depending on the size of your turtles, you might be able to get away with a more affordable setup and keep them safe. Maybe some handy people on here have ideas about building partitions; that would also have to be a temporary situation I imagine.
Long story short, if they're already fighting enough to injure each other, it's time to separate; and it can get much worse in a split second.