I'll tell ya', I didn't think dosing iodine mattered, until I did. I have xenia that wouldn't open, at all, and were totally shrunk up, until I added the recommended dosage of lugol's solution. They opened further than ever before. I have an lps, softie dominated tank, and from what I've read they use up the iodine in the tank rapidly. I've got shrooms, zoas, an anemone, softies, lps, and all that. I dose 2 part, and just started dosing bulkreefsupply.com's 2 part, with magnesium. I haven't dosed the mag., yet, but have the alk., and calcium. The only problem I've noticed is my gsp's have closed up.(I believe it's due to heat issues, and a lower than normal alk., which I'm resolving) I started out with tech cb 2 part, and it worked great, for a year. Switched due to the lower cost of the bulkreefsupply.com stuff.(I do not work for anyone in the industry, I just found them to be cheaper on some stuff, than who I bought from, before.) I've added purpleup, and it may have worked or just that nature took it's course. I started with powder alk., and calcium additives, but my params. swung too much, so, I switched to 2 part. It is a lot of work, though. Occasional adjusting, and daily dosing can be tiresome. I'd do some more reading, and make my decision based on stocking, and ease of use. Just my 2 cents.