Common myths regarding Cryptocaryon Irritans, aka Marine Ich:
1. Garlic cures it - Not true, it's used to entice fish to eat, and at best an immune booster.
2. The white spots are gone, it's cured - Not true, the parasite has just moved off the fish temporarily, as it's part of the lifecycle.
3. Moving a fish to QT stresses it and it dies - Not true, stress doesn't kill a fish, leaving it susceptible to a parasite that compromises the gills does. If moving a fish to a new tank was a sure fire killer, then the trip from the ocean to our tank wouldn't be possible.
4. Clean water and a good diet cure Crypt - Not true, a good diet and clean water simply make the fish healthy enough to fend off a parasite at times, but it will eventually succumb to it at some point.
5. Certain Stains of Crypt are Immune to Copper - It's possible...maybe...but the truth of it is that most times folks have it reappear after a treatment means that they didn't do it properly. To short a treatment interval, improper copper levels, and improper QT are surefire ways for copper to fail.