Who takes care of them while you're at college?
they have a feeder and i show up to do water changes at least every other week. my college (rutgers) is only 35 min from my house, so its easy to go back and forth to dump my laundry and take care of the girls.
D they bite the nerite's antennae?
i dont think so. they grew up with that nerite, and i dont think they even notice that its a living animal. i never saw them lunge toward it, and i see the nerite in a different spot every time i look, so im pretty sure they are coexisting just fine.