NY_Caveman
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Nerites are obviously small and are good at getting into tight spots and eating detritus. They will also go after green film algae. My Nerites often bunch around the top of the glass as well. I always suspected they were going after the green film algae up there near the light before I could even see it.nerites... Nope. They all sit at the top of the waterline in the corners of the tank. Big groups of 10+ sometimes in one spot. Never move, I can pull them off and dump them into the sand, and the next day they are back in their spot.