I have one weird betta in my sorority that might be transgender or something. She was sold to me as a female and definitely has a gonopodium and an egg spot, so that settles that, but outwardly looks more like a male in body type, fin length and most of all, behaviour! The other females completely ignored her in the beginning, but moved aside for her when she passed -- so I thought she was super dominant. But then I saw some of them flirting with her on occasion. She also appears to have claimed a territory in the back corner that she chases all the other fish out of. Never aggressive though, I've never seen her exchange blows with any fish, it's all just display.
And surprise, surprise, she steals all the food. All of it. And then just swims around with it. "Nananana, this is mine and you can't have it!"
One of my male bettas, Kyoto, was housed with a pair of plecos for a short while that I was quarantining extensively for my main tank. So I dropped in floating and sinking food just before lights out, thinking that would be a good trick. But no, Mr. insisted on only going after the sinking food. And sitting on the bottom half an hour gobbling up the oversized wafer before moving on to his floating food. Not sure if he was just weird or very smart.
I seem to have finally won my battle with Mu and Jing the dojo
loaches, who disappeared into my filter box several times a week despite my sealing that in every which way I could think of. Including a hole on top the size of a finger that sits well above the water line and takes several inches of crawling on the dry cover to get to. Eh. They haven't been in there for a month now, so I think I finally managed to thwart their evil plans for good.