I went with Cupramine since it's supposedly safer and non-chelated at .18ppm. Initially, I didn't agree with the directions stating to use 20 drops (1 mL) per 40 L (10.5 gallons) the first day, wait 48 hours, then repeat, so I questioned not only the ramp time, but the dosage itself. Bob Fenner's wetwebmedia site has info on .14-.18ppm effective copper dosages, but I did not save the bookmark. My experience with copper is very limited, but my understanding is all fish have varying tolerances, so I chose the lowest effective dosage. Will it always work? I don't know and I've never used it for ich, but the marine velvet fish I cured were pinched from dehydration, respirating rapidly on the bottom of the tank, full of the dusty velvet parasites and had signs of septicema.
Seachem makes Metro and Focus, I used both. Metro instructions say, "To feed, blend 1 measure with about 1 tablespoon of frozen food paste. To minimize loss during feeding use with Focusâ„¢. Food may be refrozen."
Levamisole is sold online as a pigeon dewormer, I dosed one crushed tablet into the 20 gal QT, it can also be used in a dip. It's highly effective and can be overdosed safely (within reason).
I've also used NFP's Paracide-X, but I needed A LOT of fish food to properly dose the med because I couldn't measure .05mg powder to make a small batch, so for this product a scale is needed.
That's all I know, or at least what I think I know
Ziggy is currently zipping around the tank looking for every last blackworm! For him, Formalin proved to be the most effective method for stubborn flukes, although, I still have not opened that scary DeLos bottle, so I can't comment there. He still has small secondary infections that pop up, but I have watched his immune system take care of all of them - also been feeding with Selcon.