Originally Posted by
fau8
http:///forum/post/2840236
I have been told that the iodine is one of the base components of the soft tissue of zoos and other soft corals. I do test for iodine and after a 15% water change the levels are fine, but by mid week there is none present, so I dose to keep it up. My tank is heavily stocked with zoos and mushrooms. I however think the main cause for slow growth is inadiquate lighting.
The corals you listed have no biologic requirement for Iodine. There is nothing wrong with maintaining natural levels though. If you've been dosing a long time I would not recommend stopping suddenly or it is possibe you could damage your corals.
The problem with dosing Iodine is that it can be very harmful with only a light increase from NSW levels and testing is difficult. It can make life harsh for Zooxanthellae and most crustaceans. With corals it can make them more colorful as the Zooxanthellae population decline. But a sudden withholding of Iodine can cause Zooxanthellae population in coral to increase suddenly in coral tissue and can damage corals. It's like giving a human heroine for a year or so. They are much more colorful and seem healthy until you take it away.