I think every "dip" with a pesticide or "dipping agent" like revive or coral rx has the potential to stress and/or harm the coral that we are trying to treat. Frags are sensitive to all the changes around them from simply handling while being fragged, being out of water, rapid parameter changes from one tank to another, new flow and lighting schemes, the strange and unusual physical and chemical properties of the dip being utilized, on and on. I think it speaks highly to the incredible survival success of coral that just a few frags are lost compared to the large numbers that survive going through the process of being trimmed and shipped off to a new home. I would always like a kinder, more Eco-friendly, easy to use, kill all the bad stuff and none of the good stuff dip, but for now, I'll continue to use bayer and enjoy my success and try not to overly mourn my few losses. As we share our experiences, we hopefully learn how to diminish the morbidity and mortality of coral through the "dipping process". And indeed, we do seem to be tweaking or adjusting are dipping protocols over time. Although for now, overkill makes more sense than under kill when it comes to aefw.
Ultimately we have two goals: 1) kill or remove unwanted pests 2) don't kill or harm the coral being treated. And by all means, nobody wants an infected sps with aefw to somehow get past our preventative measures. Absolutely want all aefw killed or gone on all newly imported frags and the absence of eggs ( unless and until we find a natural predator or an in tank treatment that is not harmful to the display and its desirable inhabitants.)