Good to know. From what i read as long as ph and temp match it isnt too hard on the fish, but various athorities differ on their opinion. Used on my firefish, and bangai when i thought they had ich (turned out it was dust on the firefishes) with no ill effect. But i do agree IMO its not something that should be done as just part of every fish addition.
I DO use on the LR or plug portion of any frag i buy, but not on the coral itself, to dislodge any hitchickers.
Again I Did read that its much more stressfull on certain fish, so probably should not be used unless needed....Only did it this time due to my plan to not QT. And because of the certain store i purchased from and my lack of trust for their livestock.
My hope is this was not part of the reason why Drogo didnt make it, as i would hope the effects of a FW dip would show day 1 or 2, and starvation week 2 or 3. The 4-5 day part makes me think there was an unknown underlined cause.