You be able to tell what type they are once they grow a bit.
They usually harmless, if you don't mind seeing them.
Pros:
They aerate you substrate & keep it clean from left over food.
Cons:
They're prolific breeders when they have a good food source & can quickly take over your substrate.
Do you have any plants?
It could be pond snails.
Trumpet snails will have a cone shape, while ponds will look like a normal snail but flat.
Apple snail also look like a normal snail too.
What you do to trap them:
Place a bowl with lettuce in your tank @ night.
Wait a few hour or even leave it over night.
But remove the bowl before the lights go on.
Repeat until your happy.
You can also buy a few different types of loaches that luv to eat most snails,or find a friend who keeps loaches who's looking for treats.
Puffer like snails too, but most puffers don't do well with cichlids.
If they're not trumpets you can give them to puffer keepers too.
Trumpet snail can break the beaks of puffers.
If you have no takers, I usually try to kill them, I don't like to introduce foreign creatures into my native habitat.
Boil them, they're pests.
