. I think they are unsightly so to try and to ensure I don't get any in my tank I always bleach dip new plants in a 1:20 mix of bleach to water for about 2 minutes before giving them a good rinse under the tap then again in dechlorinated water. This will get rid of 99% of snails from plants but every so often one will get through who I crush. They are next to impossible to get rid of once you have them. There is a worming product called Flubenol 15 which you can dose your tank with if you have a major problem with them but I'm not sure if it effects certain fish or not. You'll have to do some research. Hope that's been helpful. 
Beware though. Fully grown Clown Loaches are capable of reaching 12"+ so need a big tank to grown into. They are also a menace to plants so are not an ideal snail solution for many people.Also, i had this problem a few months ago and i got three clown loaches to get rid of them. They did an AMAZING job. I havent seen a snail since. The only problem after that is getting rid of all the shells which can throw off your water parameters. Good luck
