New reef and Fish with gill flukes

[R33f]

I have a new reef and i introduced 2 clownfish. Within a week very active clown died and the larger 1 one didn't eat anything from day 1. Was hanging upside-down heavily breathing and hiding... symptoms relate to many diseases..
Since 3 days I started dipping the remaining fish.. First dip was in saltwater and Paragaurd.. after approx 30 minutes the fish left gill I saw open wound.. I guess it was a gill fluke.. First was not heavily breathing but stayed same and hasn't eaten although I tried Vitalis Marine pellets, Frozen Mysis Shrimps, and live hatched Brine Shrimps.. Bioled Peas..

Question is now that shall I treat the tank with Parrazi and keep dipping the fish with daily ParaGuard dips.. Or Introduce new fish i. e Juvenile Hippo Tang, Juvenile Foxface and 2 spot bristletooth tang a little big.. and treat it with Parrazi in display tank..
My Tank is

80 Gallon
Redsea Live Sand
RODI Water
Salinity 1025
Redsea Salt
Sump 30 Gallon

Either I can treat beforehand but if Inam to introduce new fish why not treat them aswell with tank.

I was wanred not to introduce the fish directly but I was monitoring the fish in the local reef shop over two months.

Am already confused what could be best..

Just do dips with Paragaurd plus alternate day freshwater dip and wait for 2 weeks to introduce new fish as the flukes or flatworms die when no host is available..

I have attached the videos.. 1 is before the Dip
Second is in the dip Paragaurd.. and if yoy notice there is some gill hanging on left side.. last is the after dip..

 

[R33f]

This is today's video after freshwater dip..

its a bit pale but i need experts to check if i am wrong.