Sealing divider for Bettas in same tank.

May 19, 2017
Hi Everyone, I have a brand new glass drink dispenser, I think it's about 6 gallons big with a spiquet at the bottom. I need to put/seal a divider in the middle to keep the Bettas separate but this is a little tricky considering the bottom and middle of the jar is bigger than the opening. Does anyone have any suggestions?