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My mystery snail is lethargic with a cracking shell. What can I do?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Male | 1lb

I have 2 Mystery Snails and a betta in a 3.5G tank. Tank is filtered and has a heater. One snail has not grown at all while the other has nearly doubled in size. He is lathargic and I rarely see him eat his food or even come out of the shell. His shell has turned to a dull dark brown colour and looks to be cracking a little bit. Does this sound like a water issue? Does he sound sick? What can I do to help him. In the last picture, he is the smaller snail in the front.

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1 Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 2nd, 2018

You can gently scrub the shell with a soft bristled toothbrush. If the brown coloring is due to algae growth, this may help. A minor crack should heal on ownit's own. Maintain pristine water quality to aid in recovery. You can use a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Perform partial water changes as needed to stabilize chemistry and/or to improve water quality. A vacation feeder block can be placed in the tank to provide extra calcium for shell health.

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