Don't want to seem like I'm dogging you, but read the first response to the article, there's some very good points...
Too many people just up and start dosing things. I did it for years, in fact I did a great many things for years that did nothing but cost me a small fortune. In fact, until I started asking questions -and listening to the advice of the guys that were having results- I was having crash after crash. I give credit 100% to the reefcentral forums.
"Got hair algae? Shove some phosguard in there! Got high silicates? Well you'll need to get rid of the silicates from the phosguard!" "You want your coral to be red? Here, dump in some potassium!"
I just wanted to share...15 years at this, and only now am I having what I would call good success with sps. That article doesn't even talk about testing properly, it just says "things not purple? Do this then!" It says watch your coral to see if you're doing something wrong, and he even give dosing amounts, without qualifying it with his tank size/water volume. Who dumps something in and then watches to see if the coral starts to burn away?? People who don't know what they're doing, that's who. As teebone says, take everything with a grain of salt...whatever your salt happens to be.