Helmet Cowfish quarantine

[infpalex]

Is it safe to use medications to proactively treat these fish before adding it to the main tank, or should I just watch and monitor? I was planning on using Prazipro and Cupramine. Thank you in advance for the help!

 

[ThRoewer]

Copper may cause box and cowfish to get Lymphocystis and won't kill off everything, especially brook is not affected at all.
I would rather do TTM to prevent ich. And against all the other protozoan, turbellarian and crustacean skin and gill parasites I would do formalin dips during the transfers.
You could additionally dose CP in the TTM tanks to be extra sure.