Well Ive always heard that nerite snails have a pretty large bio load in an aquarium. This always made sense to me because snails are fairly large creatures that do create quite a bit of waste. But then I started thinking, nerite snails feed on algae, algae feeds on mostly nitrates and phosphates created by fish waste and fish, so really as long as you aren't supplementing the snails diet with other foods, shouldnt they have more of a neutral bioload? After all, most of the nitrogen that accumulates in our tanks originates in fish food we add to the aquarium, if we aren't adding any extra food for the nerites, how can they themselves be creating extra nitrogen? Just a question that's been puzzling me, wanted to see what everyone else though.