iodide dosing?

Anyone do this and does it help? Good idea or not so much?

Some people do dose iodide (lugol's) or a safer alternative iodine.  However, I wouldn't do much dosing unless you have a test kit to know for a fact that your levels are low.  Too much iodide can be quite detrimental, and it typically is very concentrated.

What salt do you use?
What is your frequency of water changes?
What percentage of water do you change?

Depending on your answers to these questions, would likely determine whether you need to dose. Chances are, if you are using a good quality salt and are changing 5-10% weekly, your levels should be adequate. 

Another possible explanation your tank is insufficient is that your blue and purple colors may not be popping as well.  However, this explanation is only valid if the rest of your tank is in fine working order (supreme water quality, adequate lighting, flow, and stable Alk/Ca/Mag).  In other words, if you are unhappy with coral color, get those basic needs dialed down first.

Good luck!

Ca @ 480 ma 1440

I dose Iodine. It is essential for snail and crab health. Shrimp will not molt or reproduce without it. Low iodine will cause great harm to Zoa's, and most softies.
As with anything High iodine will harm the tank. But remember skimming takes out many of these chemicals over time.
Word of caution, weekly water changes sound great. (unless you run big systems) but you can cause harm to your tank if not careful. Remember the water is live. If you’re not lettering it build up to sufficient levels the tank will always be in a small cycle. Among other issues you can cause.
I do 44 gallons on my 200 once a month. Vacuum sand and sump at the same time.

I've been dosing 2-4 drops a week in my 120 for months with no testing and no problems. Corals all look good and zoas and palys have bigger polyps.

I dose 2 drops in my 60 a week and seen big difference in my tank once I started. I also dose 2 drops of chromamax every other day.