So fresh water is for some pest
Hydrogen peroxide is for healing?
Furan 2 is for bacteria infection
Iodine is for?
Revive is for tissue damage?
Kinda lost in this area... Ive never had much sick until recently
I never believed fresh RO water is useful as a dip. I think it stresses out the zoas or makes them worse in my opinion.
Here's my belief on what these dip do:
Peroxide: Getting rid of those algae (bryopsis/GHA) on plugs, some bacterial infections (I use it based on my gut feeling).
Furan2: Bacterial Infection or Zoa Pox. So far, when my zoas are sick and melting, I don't have good luck with it but I keep it just in case.
Lugols: When zoas are melting, this is what I use. Good for serious infections. So far, I saved many of my frags using Lugols. Also useful after you frag zoas (disinfectant).
ReVive: Dipping for nasty hitchhikers, like nudibranches and flatworms. The bottle also says it is useful after fragging but I haven't tried it yet. Maybe someone can give feedback for it too.
When my zoas have those weird brown slime when closed up, I use Peroxide or Lugols and a q-tip. I gently rub them till it gets loose. Toothbrush seems too abrasive to me.
As for amphipods, I think they will go after zoas if it's dead. I have tons of amphipods and I've only seen them go after zoas if it's dead.