leaves!
leaves
The water snails feed on the nuisance algae and things left on the tank.
you would want to feed it an algae or vegetable tablet that you can get from the fish store. feed the snails once a week and they should be good.
Slowly.
They eat by pressing on the Algee or what ever they are eating some eat Algee or fresh water plants but before u feed your snail u should find out what kind of snail u have and where u should keep it and what temperature u should keep it at so find out what it eats before u feed
For a water snail You will need to do a weekly 20% water change or your snail will die of ammonia poisoning. Occasionally (once every month or so) vacuum the bottom to clean up the waste that the snail produces. Also feed it lettuce or apples or carrots (washed well in warm water) and remove the uneaten food in 24 hours. For a land snail no you will not if you have a dirt bottom. Also feed it the same veggies and remove the uneaten food after 48 hours. Feed both types of snails cuttle bone or eggshells for calcium to develop a healthy shell. Good luck!
I have a large apple snail, about a baseball size. I feed it only with Romain lettuce. It survives well.
No. You should not. The snail knows the type of environment where he belongs. Salt water might kill him.
leaves
Algae, so you don't really need to feed them as they "feed" themselves.
you should feed and water it at lest twice a day.