Don't dip in just the iodine. You need to do a FW
dip with about 5 drops of iodine per gal
. Make sure to match PH with your tank. Dip them for about 5-10 minutes and give them a good shaking in the water to throw any weak ones off.
Then you need to inspect the stalks for the egg sacks. They look like little curly strings. I used a blue led
flashlight or an actinic build to help see the eggs. They glow a bit under blue light. Scrape the eggs off with an old tooth brush or similar and rinse them again in the FW
Add them back to the tank and turn off your MH
or intense lighting for the day. I just ran the actinics at this point.
There is a long thread on RC about these suckers. Some wrasse are good at eating the nudis but they are hit and miss.