I am not familiar with that product [I’ve seen it but have no info on its effectiveness, etc.]. However, it is a accepted by every advanced or knowledgeable hobbyist that you do not dose a reef tank, or even FOWLR, with medications. You just can’t do it safely, regardless of what ever individual’s may have said regarding having a positive exp.
The only accepted treatments for ick is copper or hyposalinity. Both are very effective and work within the same timeframe. Hyposalinity is what we recommend in this forum for ick, because it is equally as effective as copper, but does not have the toxic effect that copper has.
These treatments must be done in a hospital tank, if you have a reef tank. Hyposalinity can be safely done in a FO tank with no adverse effects to the tank environment [as long as there are no inverts in the tank].
What type of tank do you have?