Oohh it looks like your snails are breeding!..
i dont think a little salt would affect them...but im not 100% sure
they have been pretty lame since i put them in with himbut he doesnt bother them so im mad at them lol jk.. well if i put them in a 5 gallon bucket while i give him salt, how do i get it out so i can put them back in? nevermind lol im just gonna wait to see if he heals first.. hes a tough cookie..
that might be best^_^ keep his water super clean and he should heal up in no time!
i never use meds unless clean water is not helping.
Maybe do a few extra water changes, and keep an eye on him.