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I have a 10gallon and a 20g (its not long or tall I think it’s just normal) and I want to turn one of them into a divided tank for Bettas. I think the ten might be more suitable since I already have a heater and stuff purchased for it. How many sections would be best to divide it into? If I use the ten for males I might turn the 20 into a sorority but I’m not sure yet. Also what is the best diy way for tank dividers?