There will be no record of an inspection on New York State DMV records. You cannot renew the registration if there is no DMV record of an inspection within the past 12 months. If you must renew the registration before you get a New York State inspection, call 518-486-9786.
You will need to blanch a piece of cabbage or lettuce and then sink it in your tank overnight. The next morning you can just pick off the snails from the piece of cabbage and repeat the process with fresh lettuce till the numbers come down. This methods is effective against all snails but not against snail eggs.
Koi eat earthworms, Georgia reds, nightcrawlers, pinks, etc. Some people say that you should drown the worms in water first because the hazardous soil is expelled from the worm when it drowns and goes flaccid. Uh, my fish wouldn't eat them dead like that, either.