Great detailed information. Learned the hard way as i don't have a quarantine tank! Always wanted a purple tang, and i finally got one at a hefty price of $85 for 1/2'" size. He did well for a few days and then i believe had ich. Panic set in. i was worried about infestation of my whole tank. Option of buying medication online and delivery was out of the question. Got Dr. G's Medicated Nutrition, medicated frozen food! from Pets Co. A great product! Within 4-5 days it all cleared up