You’ve probably heard that betta fish prefer to live alone, and for the most part that’s true, but they can actually live with a few select tank mates. The mystery snail is one such pal that is docile enough to cohabitate with a betta fish. Having a betta fish in your tank is great, but soon (if you don’t have it already) you’ll get the itch for more than one marine creature in there. If you’re not ready for a sorority of females or other tankmate fish species that require at least 8-10 gallons or more, you should consider the mystery snail.

Mystery snails require a similar water pH at 7.0-7.5, temperature between 68-82 degrees fahrenheit, and regular day and night cycles just like your betta fish. Your snail won’t be as active as your betta, but they can be very active when they are feeding and in an exploring mood. It is recommended that if you do choose to add a mystery snail to your tank that it be at least 5 gallons in size. This is because of good ecosystem care and space requirements, and the bio-load or amount of waste that can occur. The larger the tank, the more community members that can exist in the tank and remain healthy.

Mystery Snails are Cleaners

One of the biggest advantages to adding a mystery snail to your betta’s tank is that they feed on algae and fish flakes and betta pellets. They will scale across the substrate and sides of the tank’s glass to clean up all that excess waste that builds up! One man’s trash is another man’s treasure right? Do be careful though as mystery snails can become very stressed from similar situations that betta fish undergo. When adding them into the water, make sure they land right side up, and always acclimate them to the water temperature and its other parameters. Not doing so can result in death on day one.

Snails that go motionless for a day or more, or are upside down or floating may be dead. The ‘smell test’ or removing them from the tank and sniffing near them will be the true test. A dead mystery snail expels a very gross and pungent odor. Their average lifespan is much shorter than a betta fish’s and is typically around one year. Remove dead snails immediately to avoid disease and tank pollution (e.g. ammonia) which can harm your betta fish. 

Gary is on the move, cleaning cleaning cleaning. #mysterysnail #mysterysnails A video posted by Betta Fish Fanatics (@bettafishorg) on

Mystery Snails Like to Escape

Although I have never experienced this myself, even from tanks without lids, some mystery snails can be great magicians and escape their habitat. Take care by keeping your tank’s lid on at all times, and lower the water level to prevent any mishaps. Escaped mystery snails should be acclimated back into the tank as soon as possible as they can dry out very quickly and die.

Coloring also varies across mystery snails because what their name implies many are a mystery. The most common coloring is blue and dark shell colors all the way to cream and yellow. They do need a male and female to mate so you also won’t have to worry about them reproducing asexually and taking over your tank. That is unless of course you purchase a pregnant female.

Spotting a Healthy Mystery Snail

Some things to look for when purchasing a mystery snail pal for your betta fish is signs of good health. These include the following: a strong shell with no visible cracks or pitted areas, snails that are actively moving or attached to the tank’s sides, cohabitating with living and healthy fish, and contains all of its tentacles and there is no damage to its eyes or operculum.

Good luck picking out one for your tank, and I’d love to see pictures on Facebook or Instagram if you’d like to share. In the future I plan to make an exhaustive list of betta fish tank mates, but for now I at least wanted to cover the mystery snail because it’s a great beginner addition to care for.

About The Author

Founder & CFO (Chief Fish Officer)

Founder of and betta fish enthusiast. With over six years of betta husbandry experience, I wanted to create a place that was educational and fun for other betta keepers. Stick around, you'll learn a lot!

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10 Responses

    • Bryan

      .7 gallons is far too small for a healthy betta. 3 gallons minimum with a recommended 5 gallons in size. Read our care page for more information too.

  1. Grayson

    What do I do if my beta keeps jumping and attacking my mystery snail.

    • Bryan

      Hi Grayson. What do you mean by attacking? Is he physically injuring the snail or just curious, lunging at, and being territorial towards it and flaring? If he’s actually intolerant to having a tank mate and is injuring the snail then you should remove him from the tank as not all betta fish tolerate tank mates. The size of your tank can matter too.

      • Bunny

        My male Betta nips and flares at my 3 mystery snails all the time… They are new arrivals at this point (They’ve been in the tank for 3 hours so far) and all 3 of them have been nipped at and bitten by my Betta. I think that an antenna may have been harmed on my smallest, but I can’t quite remember if I adopted him that way. I don’t think so. I got a 10 gal so I could have my Betta and some snails live in it and I would like to keep them all there, as 10 gal is very big for just one Betta. I do have a 1.5 bowl always handy in case something goes wrong with any of them, I would just like my creatures to live in harmony 🙂

  2. McKinsley

    I have a purple mystery snail and just got a half-moon betta. I’m debating weather moving the betta in with the snail ( 2.5 gal.) or moving the snail to the bigger community tank.(55 gal.) The community tank includes a goldfish and we just got the goldfish and I have no idea if he is aggressive or not and read they might attack my snail. I also don’t want to over-feed my betta killing him and/or having my snail starve to death. Any help / decisions or tips? I love my snail and betta and don’t want either of them getting hurt or killed!

  3. CHARLENE Scott

    I have a crowntail Betta male in a 1.5 gal tank. I have algae what can I do. The light Is not on all the time it’s ked light changes color. Sunlight does not hit the tank.

    • Bryan

      You should get a larger tank. 1.5-gallon is too small for a betta and the water quality quickly diminishes. To help fight algae you should do more frequent water changes and scrub the algae off of anything it’s growing on. You could also introduce a live plant or two.

  4. Rachel

    How do I feed my snails fish food without my betta fish eating it all? I am concerned about her overeating if I leave fish food at the bottom of the tank.

    • Bryan

      Betta fish are surface feeders, so they shouldn’t bother with any food on the gravel in most cases. Also, snails will feed on algae in the tank too.


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