20 Gallon Tank Tank divider for betta fish

Hello everyone!
I have a 20 gallons tank with a male betta fish, 4 albino corys, 5 harlequin rasboras and 3 nerite snails.
I have had so bad experience with the tank mates I have brought these last months (neon tetras nipped betta and corys, molly fish nipped betta and corys and betta killed 2 of 5 ember tetras).
Today I decided to bring 5 harlequin rasboras and also put a tank divider to avoid any fight, so now betta fish is alone with 1 nerite snail. Was it a good decision? Is it ok to have a tank divider? It is fine the size I left for betta fish? Thank you!

 

Looks okay for all of the fish but the corys and the molly. Is it possible to get the betta it's own separate 5 gallon tank so that the other fish could have the whole 20 gallon?

 

Looks okay for all of the fish but the corys and the molly. Is it possible to get the betta it's own separate 5 gallon tank so that the other fish could have the whole 20 gallon?

I don’t think I can get another tank right now maybe later yes. Currently the options are, either let them be together again and take another risk of aggression, or keep the tank divider in there

 

Hello everyone!
I have a 20 gallons tank with a male betta fish, 4 albino corys, 5 harlequin rasboras and 3 nerite snails.
I have had so bad experience with the tank mates I have brought these last months (neon tetras nipped betta and corys, molly fish nipped betta and corys and betta killed 2 of 5 ember tetras).
Today I decided to bring 5 harlequin rasboras and also put a tank divider to avoid any fight, so now betta fish is alone with 1 nerite snail. Was it a good decision? Is it ok to have a tank divider? It is fine the size I left for betta fish? Thank you!

I think it fine to have a divider

 

I don’t think there is anything wrong with having a tank divider, I would just make sure the betta has a good amount of space.

 

I don’t think I can get another tank right now maybe later yes. Currently the options are, either let them be together again and take another risk of aggression, or keep the tank divider in there

Well in that case, you're current set up should be fine. Just monitor them for a bit to make sure everyone has got enough space.

 

Well in that case, you're current set up should be fine. Just monitor them for a bit to make sure everyone has got enough space.

Thank you! How can I make sure the spaces are ok? I just calculated the water volume in the betta fish space: 6 gallons

 

Thank you! How can I make sure the spaces are ok? I just calculated the water volume in the betta fish space: 6 gallons

Sounds good