ugh, snails are nasty. I'd get rid of them. There are some products out there to clear up snails, but these are risky to the fish. If you have no loaches or puffers or something to eat them, your best options are to either add some salt to the water, it kills some snails, or net them out best you can.
Or, get clean saltshakers and put them in the tank, without salt. Maybe put some fish food in them. The shakers, or any other small container like them, can catch the snails only and not your fish.
[i didnt write this] Control through food - Put a small saucer with lettuce or a couple of fish food pellets attached. Dim the lights or turn them off. After a few hours the snails will collect on the saucer and you can remove them. This will not eliminate the snails but can keep the population in check. If you have lot's of bottom feeders this may not work since the bottom feeding fish may devour the food before the snails can get to it. One alternative that I have heard about, but not tried, is to take a 35 mm film cannister and punch holes in the lid. Put the bait in the cannister and then remove after several hours or overnight. This will keep your bottom feeders from eating the bait and the holes will allow the snails to enter.