Thoughts on Iodine...
I use Tech-I from kent- I put in a cap full or so about once a week. I stopped for about 2 months cuase i get really busy, and did not notice much of a change, so I can't really say that it helped or not. The only other thing besides water changes I do for my tank is to put in some kent super buffer dKh with coraline accelerator... and as you can see from the photos of my tank, things are doing pretty well.
I haven't been on here in a while, been really busy with my 11 month old dauhgter and my wife who is almost 3 months pregnant with our second child
As for polyps, they DO grow fast under the right conditions, but 'fast' is a relative concept. If you are expecting to see a big difference in a months time, that probably wont happen. Polpys are good corals to start with, lots of choices, lots of colors, same as with shrooms. However, I am a huge fan of different types of leather corals, as you can tell by the photos of my tank.
most leathers will cost you a bit more though than the polpys.... you should find someone in your area who would give you a few polpys just to place in various areas, or pick up some frags cheap at your LFS. Like someone else mentioned, once they get going, they do seem to grow like weeds!
Good luck-- this hobby is a blast!
Some photos...
Whole tank:
Right side:
Left Side:
These photos are from about 4-5 months ago-- I will TRY and start a thread later today once my lights go on with some photos from today-- LOTS of changes since these photos were taken... some of the corals in here are double in size now...