The Powder is great. I use the powder as a preventative in QT, but the powder cannot be used in a reef tank.
I was successful in curing Velvet on a foxface in QT, and I haven't seen Ich since employing the powder as a prophylatic. I believe the Key ingredient is CP (chloroquintine phosphate). One shot and you're done with the powder. I have heard wrasses have difficulty tolerating it, but I have used it as a preventative successfully with wrasses.
Pellets have the same ingredient, and it should be effective. Seachem focus is another additive which might help make it palatable if they won't eat it. Fingers crossed.