iodine test kit

I was wondering if their is a good iodine test kit on the market? Also, is it expensive? I have been adding Lugol's solution for a year now and never thought to test since basically using the minimum dosage...Since I have two different kinds of Xenia, a toadstool leather(sarcophyton), peppermint and fire shrimp, I think it would be beneficial for me to get an iodine test kit. What is a good level for iodine in a reef tank?
The other question I have is regarding water hardness. My water is around 350(GH). It should be under 200!!YIKES!!!What is the best product to use to lower my hardness? My calcium is also very high>about 500, which I think has something to do with it.

 

http://www.northcoastmarines.com/tstkts.htm

There are lots of test on this site.

 

I use the Seachem Iodide and Iodine test. I like the Seachem brand because instead of 5 or 10 ML for each test, they set them up in a little dish and use a few drops of water. With a 10 gallon reef, that is an important savings (I test about 12 different parameters).

For hard water I have always read to filter it through peat moss? or something like that. It sounds awful to me, and I have never done it. My hard water problems were solved when I got an R/O unit.

 

I would leave the calcium alone and test in a week to see if it's going down. Don't put any elements in your tank that includes calcium.