I use Prazi-pro for anything parasite involved internal and external.... whatever you do.. don't manually remove it. I've seen so many fish get a nasty secondary from people yanking them out.. and killing the fish ( usually it's from their butts) Jungle labs parasite clear is also often used.. but I swear by prazi. I usually do 1/2 dos day 1.. 1/2 dos day 2.... then do my usual WC routine ect.... worms still there.. repeat process in 7 days from last dos. UNless I know the fish is "tough as nails" i always 1/2 dos any meds the first time I use them on a specific fish to see how it reacts to it. odd behavior = 50% WC ASAP and carbon ( I don't normally use carbon in my tanks)