Most species of freshwater snails, discounting most adult specimens of species belonging to the family Ampullariidae, which primarily subsist on aquatic plants as adults.
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It is the only fish that will graze on "black brush algae" (freshwater Rhodophyta, or red algae), but even so will eat anything else in preference.
Green Bee-eater | Soul Eater | Red-throated Bee-eater | Metal Gear Solid 3: Snake Eater | Man-Eater of Kumaon | Green algae | green algae | brown algae | The Hasheesh Eater | Thak man-eater | Soul Eater (manga) | Shown above as a result of a 7 week period where the columns have been allowed to grow algae, cyanobacteria and other bacterial colonies. Of specific interest are the red regions of the middle column, indicative of purple non-sulfur bacteria (e.g. ''Rhodospirillaceae | ''Novitates Zoologicae'' vol XVII 1911 Plate 9 Blue-cheeked Bee-eater | Matter-Eater Lad | International Code of Nomenclature for algae, fungi, and plants | In Defense of Food: An Eater's Manifesto | Gods Eater Burst | European bee-eater | Coralline algae | Beyond Thirty and The Man-Eater |