Anybody out there dosing iron (Fe) in their tanks?

My macroalgae (C. taxifolia) has been doing poorly lately. It gets bright yellow splotches on it, which spread, and eventually the whole "leaf" bleaches and turns clear. My understanding is that Fe will increase macroalgae growth. According to Reef Aquarium Vol 3. Fe will also benefit the zooxanthellae in corals.

So, I'm thinking about giving it a try. However, I would first like to hear of others experience using Fe in their reef. And before anyone says it (as I'm sure some one will). I do not believe that you should "only dose what you can test".

Lastly, is there a DIY recipe for a reef Fe supplement?

Thanks for any input,
Tom