I have a male betta who is not very active. He is in a 10g tank. I recently got a rubberlip pleco, who will get about 5in, as a tankmate. They did just fine when separated, but they could see eachother. Now that they are in the tank together, my betta keeps flaring at the pleco, but has not attacked him, gone no further than a tap once. Is there something I can do to help them get more accustomed to each other?
Also found out that 2-3 small otos (dwarf suckermouth catfish) are great tankmates for an active betta, if you have a big enough tank. Remember 1 gal=1 in fish.