My Zeddie made some pretty sweet nests when he was in the 29 gallon and i thought he was a she. When i added more girlies for a sorority, he went nuts chasing and nesting. so we put him in time out, asked some people one here, and voila, poor guy was, well, a guy. and had all the ladies he could want. he still stares longingly into the 29 from his half of the 5 gallon.
earlier, Swish had a bubble nest against a fake plant leaf! it was tiny tiny, like half an inch in diameter, but i was excited. he was my first boy :3