My Mystery Snail Laid Eggs - What to Do Next

If a Mystery Snail laid eggs above the water, that location is normal for this species. Before moving the clutch, confirm that the adult is a Mystery Snail, usually sold as Pomacea diffusa, because other apple-snail species can produce very different clutches and may be regulated where you live.

The USGS profile for Pomacea diffusa describes clutches laid above the waterline and notes that a clutch can contain hundreds of eggs. Decide whether you can house or rehome that many snails before trying to hatch it.

Decide Before You Incubate The Clutch

• Identify the snail. Do not use Mystery Snail advice for an unknown apple-snail species.
• Choose whether to hatch it. Leave it in place, move it to a humid incubator, or remove it if you cannot keep the hatchlings.
• Keep it above water. The clutch needs humid air, not submersion or direct misting that leaves it wet.
• Prepare before hatching. Set up cycled water, safe food, gentle filtration, and a realistic plan for extra snails.
• Let the hatchlings emerge. Do not break apart or rub a clutch to force snails out.

What Should I Do First?

Option 1: Leave the egg cluster where it is. This can work when the clutch is secure, remains above the water, and the covered tank keeps the surrounding air humid. Do not spray the clutch until it is wet.

Option 2: Remove the egg cluster and make a DIY incubator. Move it only after the outer surface has hardened enough to lift without crushing. A simple container can hold humid air while keeping the clutch dry and above water.

Option 3: Remove and discard the egg cluster. Choose this when you cannot provide enough cycled space, food, or homes for the hatchlings. Check local rules before giving away or selling any apple-snail species.

How Long Until Hatching?

Incubation changes with species, temperature, and humidity. A controlled study of Pomacea bridgesii recorded development over 15 to 24 days at 23°C / 73°F. Treat that as a reference range, not a guaranteed hatch date for every clutch.

Do not promise a fixed number of babies or survival rate. Clutch size, fertility, hatching, and early survival vary with the species and conditions. Prepare for more hatchlings than you expect.

How Can I Tell If They Are Fertile?

When your female snail lays her eggs, she will do so either in the lid of your tank or above the waterline of the tank. If they are freshly laid, you will see how soft they are. The eggs will start to harden after a day or two, and within a few days, you will be able to see some of them change color.

Color alone cannot confirm every egg. A clutch that stays dry, collapses, smells bad, or grows obvious fuzzy mold is unlikely to be developing normally. A fertile clutch often darkens and becomes uneven as hatching approaches.

Can They Reproduce Without Mating?

If you recently bought a snail or two and suddenly have an egg cluster without seeing any mating in your tank, this could be the reason.

A female can store sperm after mating and may lay more than one fertile clutch later. This can make a newly purchased snail appear to reproduce without a male in the current tank, but fertilization still came from an earlier mating.

Just know that female snails can also lay unfertilized eggs, so technically, they can lay eggs without mating; they just won’t be fertilized.

How To Hatch A Clutch

As mentioned in option 1, if you have a lid on your tank, you can leave the cluster of eggs where they are and ensure they don’t get wet or submerged in water.

If you want to build a DIY Mystery Snail Egg incubator, you will need the following items:

• Tupperware container with a lid that snaps on or seals well (you will need to make holes in the lid)
• Paper towel sheets (about four sheets)

The first step is to make tiny holes in the Tupperware container lid right along the edge of the lid. Next, you will need two paper towel sheets that you will wet with the tank water. The sheets have to be wet but not dripping wet.

The wet paper towel sheets will provide the necessary humidity in the container. You can fold the two wet sheets to fit into your container’s bottom. Now, you take your two dry paper towel sheets and fold them to fit your container.

The dry paper towels will be the barrier on which you will place your snail egg clusters so they can remain dry at all times. Now, you can remove the egg clusters from your tank lid or glass by using your fingers and gently wiggling the sides of it to encourage them to release.

You might squash an egg or two, but it definitely did less damage than when I tried to use a scraper to lift it from the glass. Ensure you wait at least a day before attempting to remove the egg cluster, as it needs to be hardened by the time you remove it.

Open the container briefly each day for fresh air and wipe condensation from the lid before it can drip onto the clutch. Keep the incubator at a stable temperature away from direct light. If it floats in the aquarium, secure it so tank water cannot splash or flood the eggs.

As the hatch approaches, the clutch often darkens, softens, and develops small openings. Leave it alone and let the hatchlings emerge on their own.

Breeding Box Or Nursery Tank

Prepare a cycled nursery or protected breeder box before the clutch hatches. Separation makes food easier to reach and protects small snails from fish.

Match the stable temperature and water chemistry used by the adult snails. Test ammonia and nitrite, provide gentle water movement, and check pH, GH, and KH instead of using one pH number for every setup.

An isolation box can share the established aquarium water, but it still needs enough flow to prevent waste from collecting. Check that openings cannot trap or release tiny hatchlings.

Move juveniles into a community tank only when they are large enough not to fit into the mouth of any tank mate and can compete for food.

This matters even more in goldfish tanks, where anything small enough to swallow can become a snack.

Use a turkey baster to remove uneaten food and waste whenever it appears. Check the waste before discarding it because very small snails can be pulled up with it.

Remove dead snails promptly and test the water if losses increase.

What Do I Feed The Babies?

Once the hatchlings are in cycled nursery water, offer a tiny amount of food they can reach and remove leftovers before they spoil. Do not rub, crush, or submerge the clutch to force out late hatchlings.

Suitable foods for baby Mystery Snails include:

• A complete sinking shrimp or snail food, crushed into small pieces
• Snello (Homemade)
• Algae/Spirulina wafers
• Soft unseasoned green vegetables
• Crushed Sinking Fish Pellets
• Crushed Fish Flakes

What Do I Do With All The Babies?

If you have noticed that you have too many snails and won’t be able to take care of all of them, you can always post on local aquatic/fish groups; maybe someone would like to trade colors or something else that you might need. This would help you find homes for the babies quickly.

The cool thing about Mystery snails and their color is that you can have a golden snail and a purple snail mate, and their babies will come out a different color. I think that it is so exciting to see how the babies look like with these color matches.

Another option is to talk to your local fish store and find out if they wouldn’t like to buy snails from you. You can either ask for store credit or get some cash; either way, it will help you buy your next food supply for your aquarium at home.

When talking to your local fish shop, you can also make sure of the size they would like to take some babies from you; most stores prefer the size of a pea (roughly).