Wrasse in Quarantine , a little help

[ks_reeftank]

after 3 weeks in quarantine , i saw no signs of white spots anywhere, so i put in some prazipro to do a week treatment before moving the flasher wrasse to my DT. after 2 days in the prazipro, he now hides out more and doesnt seem to wanna eat like he used to. now a white poop string. so internal parasite is my guess here. question is....

whats the next step. had a 5 to 7 day treatment planned. is all i have to do is keep up with the prazipro and water changes until the white poop goes away and it acts better?

fish is in quarantine with a purple firefish .

thanks