They way i was explained on how to do a freshwater dip for zoos is as follows. I had really good results.
Fill up a 5 gal
bucket with 3 gals of fresh ro
water. Add 5-7 drops of iodine per gal
of water in the bucket. Remove your zoos from the tank and place up side down in the fresh water. Let sit there for 10-15 mins. After you wait the time, shake them vigourlsy to remove the dead organisms. Then place them back into the tank. They will act better under actincs at first, then after 24 hours place your lighting back to normal.
All my zoos had closed up on me and I did this procedure and they seem to be comming back out and showing more. Zoos depend on iodine supplements in the tank.
Ken Jordan SMMAS Vice President
Visit our Club In Southern Maryland www.smmas.org
My tanks include 150 Tall Reef, 150 Deep Reef, 58 Gal reef in wall, and a 28 gal Nano.