It also occured to me that if you do try this setup, definitely fill them both up at the same time. And drain them at the same time as well.
I know it seems like common sense but hey they took all the seesaws out of the playgrounds so kids these days might not know these things....
Ya, I did that. Fillies one a little, then the other... hoping to only have these here for 30-60 days....
Moving stuff around to make room for larger tank...