While I generally shy away from medications, I have used Quick Cure to treat Ich. Seems I always had delicate fish when I used it. I used it at half dose for sensitive fish as per the instructions, for three consecutive days. On the fourth day, I performed 25 percent water change and added half dose for another three days. I then changed another 25 percent of water and added carbon to remove the traces of medication left. I then observed the fish for another week and if no symptoms were present,I continued with normal maint routine and put the quick cure away.