Sorry, the topic description --- I currently have two male Betta splendens each in their own 1.5 gallon tank. I'd like to get one 10G tank and just put a divider in the middle, however I know that they will become stressed sometimes even just seeing each other that closely.
That said, I'd like to be sure I can do it prior to buying the tank. Perhaps find some sort of non toxic, waterproof material to adhere to the divider so that they cannot see each other?