Often confused with Chitons, Limpets are persistent grazers, and will stay in one location until their job is done. They will spend nearly all of their time on rocks and glass. Because of their shell shape, they can withstand direct impact from your powerhead or wavemaker, allowing them to clean where other snails, and crabs especially dare not explore. Note also that limpets are unable to right themselves if they are turned upside down unless there is a strong current for them to utilize.