So the divider in my recently-purchased 5 gallon went kaput this evening (it was a Craigslist purchase so it's not refundable) and I had to run to PetSmart to get an emergency 2.5 gallon for my other betta. I could let him stay in that one, but compared to the 5 gallon, even divided, it seems like he has way less space now. Could just be a trick of the eye. Either way, it feels unfair somehow.
I'd really like to have my 5 gallon divided again, but I don't know how to go about it. I pretty much bought that tank solely because it was already divided for me. Poorly done, though. I don't want to get another 5 gallon for the other betta since I'm running out of space. How can I divide my 5 gallon safely and so the two can't see each other? They were able to see one another beforehand despite lots of silk plants on both sides and were constantly flaring and agitated.