Assassin snails are very useful at getting rid of them. I introduced a few plants and then loads of snails just appeared out of nowhere, at 1 point I pulled out around 200 snails in 1 water change. Although meds. can work, it’s a lot harder getting them out. Most meds. will only knock them out (if the meds killed them you could get an ammonia spike) in which case you still have to fish them out. I noticed when the lights are off they start coming out, turn the lights off for a few hours then do a water change and get out as many as you can. Otherwise assassin snails are good, but I have no idea how quickly assassin snails breed. Hope that helps.