LOL THAT PICTURE IS SO CUTE.
i usually let my betta nip my finger whenever they're chasing it. one day pierce got fierce and decided to hang on. i was like OMG PIERCE LET GO. -waggle hand in aquarium-
idk about fangs, but maybe griddy plates or microscopic teeth. I let Kasumi jump out of the water and bite my finger and although it doesnt hurt, it feels like sandpaper.
I've had some bettas would would nip at me but I've never been full blown biten. But I definitely notice my fish "chew" their food by opening and closing their mouths a few times after sucking in a pelet. It really does look let they go "nom nom nom" every time I feed them. It's so cute to watch. :3
Click on it and go zoom it, little white spikes coming down from above.
This is kingsley (passed, runt king - organs compressed) a day after I brought him home.