Assuming you are talking about the common aquarium snail Pomacea diffusa also called the golden apple snail here are some guidelines.
One snail per 2.5 gallons is a good starting point but no more than one snail per gallon otherwise they will over populate and foul the water. Mystery snails are good at controlling algae growth in a fish tank and will consume soft decaying vegetation.
You can keep multiple mystery snails together but be aware that they might crossbreed. Two different species of Pomacea snail cannot crossbreed but mystery snails of the same species can. This will result in offspring that are a mix of the two parent’s shell patterns.
How many mystery snails can you have per gallon?
Answer: 1-3 mystery snails per gallon.
Is it best to keep them in pairs?
Answer: No they are fine to be kept alone or in groups.
What do mystery snails eat?
Answer: They are omnivorous so they will eat algaeiviches and sinking fish food pellets.
How big do mystery snails get?
Answer: They can grow up to 2 inches.
What is the lifespan of a mystery snail?
Answer: 2-3 years.
Do mystery snails need a filter?
Answer: No they do not need a filter.
Do mystery snails need a heater?
Answer: No they do not need a heater.
What is the pH level that mystery snails prefer?
What is the temperature that mystery snails prefer?
Answer: 70-78 degrees Fahrenheit.
What is the hardness that mystery snails prefer?
Answer: 5-19 dGH.
Do mystery snails need air?
Answer: They do need air but they can get it from the surface of the water.
They don’t need an air stone.
What is the best way to breed mystery snails?
Answer: The best way to breed mystery snails is to put a male and female together in a tank.
The female will lay her eggs on the glass or plants in the tank and the male will fertilize them.
How many eggs does a mystery snail lay?
Answer: A mystery snail can lay up to 100 eggs at a time.
How long does it take for the eggs to hatch?
Answer: It takes about 2 weeks for the eggs to hatch.
What do the baby snails eat?
Answer: The baby snails will eat algae and other small things in the tank.