Blue Mystery Snails

Blue mystery snails  (sometimes referred to as apple snails, scientifically called pomacea diffusa) have a dark body with orange freckles and a blue shell and are one of the more exotic color variations of mysteries.


The shell of the blue mystery snail is actually white, not blue.

They get their blue color from their dark body showing through. Very thick shells will sometimes appear almost entirely white.

5 100% from 2 ratings
Rating 5 100%

High quality blues will have smooth, well-developed shells, opalescence and vivid blue color, but these are difficult to find in the industry as most tend to be a paler hue.

Mysteries are one of the largest aquarium snails and can grow to be up to the size of a golf ball in the right conditions!


Mystery Snail Care

Mystery snails are surprisingly hardy and don’t need an advanced hobbyist to keep them alive and well. However, there are a few things that are important for them to thrive:

Water Conditions

Mystery snails require good water conditions to thrive. They are technically tropical pets and will be most active in a range of 70-80 degrees F. They will grow faster in these temperatures and breed readily.

Soft water can cause problems for their shells, so it is important to make sure their pH stays between 7-8. If you don’t have harder water, a commercial buffer or homemade one such as crushed coral or limestone is a good idea

Dirty water or any nitrogen cycle problems such as high ammonia or nitrites can harm snails.

Copper can harm or kill mystery snails, so it is very important to make sure there is none in your water. You can use a heavy metal remover like this one I use to ensure your water is safe for them.

Many fish medications contain copper, so be sure not to expose them to those.

Diet: The Two Main Requirements

1. Calcium

Calcium is an essential part of the diet of blue mystery snails, which are invertebrates. Their skeletons are on their backs.

Without enough calcium, the snails are not able to build the layers of their shells as strong as they need to.

Most shell problems arise from lack of calcium. This can include anything from fissures, pits or rough patches and can do much damage if not addressed quickly.

A good quality calcium supplement or calcium-rich shrimp or snail food is essential. You can blend calcium carbonate powder into gel fish food or snello (6000 mg per cup), or purchase calcium sticks for a premade solution.

Unless you provide enough supplemental calcium, the shells of your snails will become very fragile.

2. Fresh Veggies

It is also very important to offer a variety of fresh veggies, preferably blanched but they can eat them raw.

They must get fed by you – it is not enough to let them scavenge what they can find in the aquarium.

Calcium rich veggies such as spinach and parsley are great choices, and they also love:

  • Green beans
  • Squash
  • Zucchini
  • Cucumber
  • Kale
  • Carrots
  • Broccoli
  • … and pretty much any veggie in your fridge.

By ensuring your snails have enough to eat, they will grow properly and their shells will remain strong.

Advantages of Mystery Snails

Mystery/apple snails will do an excellent job of cleaning the aquarium glass for you, as they love all kinds of algae.

You will be able to see where they’ve been working by the “munching tracks” they leave in their wake.

5 100% from 2 ratings
Rating 5 100%

Along with keeping the algae clean, they are also great at discovering and devouring uneaten food in an aquarium, playing a very useful role in keeping the waste broken down.

Mystery snails are a peaceful snail and play well with others of just about every kind of freshwater fish or invertebrate. When kept with nippier fish, they often learn to keep their tentacles in as they swim.

They are fun to watch and seem to have quite a bit of “personality.” They are most active in the late evening or night time.


It takes a male and a female mystery snail to reproduce (they are not a-sexual).

Females can store sperm for several months after mating and lay the eggs later.

They lay pinkish-orange sacks of eggs above the water line, which can be easily removed and disposed of if the thought of raising baby snails doesn’t appeal to you.

Otherwise, you can incubate the eggs and hatch up to a hundred mystery snails out of just one clutch!

Mystery snails are a lot of fun to have around, and the blue ones are my favorite.

Have you ever owned a blue mystery snail?

5 100% from 2 ratings
Rating 5 100%


  1. sofia o February 25, 2018 at 11:18 pm - Reply

    my aquarium new has fake plants, will this affect the snails already in my possession? they’ve never been in a setup with fake plants

    Rating: 5
    • Pure Goldfish
      Pure Goldfish March 4, 2018 at 10:56 pm - Reply

      They should be fine 🙂

  2. Prue Bennett-Jones November 18, 2018 at 8:01 pm - Reply

    I have a blue mystery snail but his new shell growth looks black. Will this change to blue?

    Rating: 5
    • Pure Goldfish
      Pure Goldfish November 18, 2018 at 10:43 pm - Reply

      Yep! Normal.

Leave A Comment