Ich according to most experts is caused by stress. remove the source of said
stress and increase temp.to 84 f if the fish can tollerate it for about 5-6
days. this method doesn't use chemicals and is better all around . Simply
reduce the temp. back to normal after all signs of ich are gone and do a couple
of 25% water changes over 3-4 days. I've bought a shoal of 25 card. tetras with
ich (cheap) and tossed them in my community tank and raised the temp. and ended
up with a nice shoal and only lost 2 to ich. It's a very risky thing to do and
I don't recomend it but it shows that heat and a friendly environment can and
will cure ich without chemicals Good luck & regards ART