<a href=showthread.php?s=&postid=7162505#post7162505 target=_blank>Originally posted</a> by leebca
A copper bath doesn't work, if you have properly diagnosed it as Marine Ich (Crytpocaryon irritans). Copper doesn't affect the parasite while it is attached to the fish. Copper kills the parasite in its non-attached stages, which is why the copper treatment usually goes for 14 days.
Where did you learn/hear of a 4-hour bath of copper?