Nerites are known for being picky eaters and only eating soft algae's both brown (Diatoms) and green. So, he will definitely eat some dead plant matter but don't rely solely on him/her to get rid of it of course. Definitely try to culture your own algae for him/her as well, Nerites are fantastic cleaners and once they run out of food, it can be all downhill from there! They rarely will take prepared foods like wafers or pellets.
(Also, nothing eats fish waste, no matter what people tell you.)
Wilds: Wajok, Rutilans, Siamentorialis, Hendra
Leopards: Luna, Astrael, Dorian, Cullen, Gallifrey
African Fat Tails: Nox and Lux
Bearded Dragon: Stormfly