I tried to build my own tank divider out of craft mesh with plastic poster holders on the sides. I thought I had it fitting well and when I tested it my betta made it to the other side in less than a minute. I have another male betta in a 2 gallon quarantine tank I want to get him in a bigger space. Any ideas on a DIY divider where the boys cannot see each other? It's a 10 gallon tank.