I have 1 Black Racer Nerite Snail on my five gallon tank. Right now he's just eating bio film. I tried to feed him algae wafers, blanched vegetables, and some sinking pellets for snails but he's just ignoring it all. I've seen reviews and pictures of people's nerite snail eating all kinds of different things. Is my nerite snail just picky? Does that mean that my nerite snail will eventually die soon?