I believe my divider dilemma is solved.
I discovered that the divider I'd made for my minibow was very very tight, unlike the ones in the 10g. So, I divided my 5g minibow, moved the bettas over there, then moved the guppies and the snails over to the 10g.
My brother had noticed that the cories didn't look very happy living with Winter. I think it's so sweet how he loves those guys. He said that they would just go sit down and make a frowny face

. So I moved out the bettas and brought the guppies instead, and so they were happy again.

It's good to see them doing their 'happy dance' again

Volta and Winter are doing well, staying on their own sides.
And Ambellina is as good as ever in her little section of the 10g
