Keyhole Limpet Snail

Keyhole Limpet Snail
Latin name:
(Megathura crenulata)

Care Level





Black, Tan



Preferred Conditions

72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025

Avg. Max Size


Minimum Tank Size


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The Keyhole Limpet Snail is an ideal choice for the reef aquarium due to its ability to provide excellent algae control. Its preference for an established aquarium with live rock and plenty of microalgae provides a natural environment for them to thrive. Furthermore, they are sensitive to high nitrate levels and copper-based medications, so proper water testing and monitoring is important. With the right conditions, these Limpets are sure to add beauty and balance to any reef aquarium.

Limpets are known to breed in the wild, typically during the summer months. Their reproductive cycle is still largely unknown, but it is believed that they breed through internal fertilization.

The Keyhole Limpet Snail feeds exclusively upon microalgae in the aquarium. If algae is not available as a food source, supplement their diet with dried seaweed.