They're ramshorn snails; very common, and will have come in as tiny babies or eggs on your live plants.
In general, snails don't cause any problems but they can look unsightly if you have too many.
The main thing you need to do it cut down on the amount of food you're giving the fish. The usual cause of huge snail populations is overfeeding. It is very easy to overfeed fish, as they don't need much food for their size, compared to mammals.
You could use traps to reduce the number more quickly and you could think about adding some assassin snails to help keep the numbers down in the future.
You're unlikely to be able to get rid of every single one, but as I said a few snails won't cause any problems and may be helpful for your set up.
P.S; you don't need to type in capitals, it can be seen as a bit rude, like you're shouting. People will come along and help you in time; don't forget we're all volunteers with lives of our own to be getting along with!