^ Hmmm...the suggested dosage for the AF Pro 1/2/3 is 50 ml per 27 gallons every day.
May work for a small tank. Wouldn't last long on a bigger tank though.
I realize that DIY mixing is not for everyone...there is a lot of upfront cost to DIY mixing, buying each elements, investing in a good scientific scale, and the labor/time to mix it correctly. Plus, some chemicals can be dangerous/flammable, so it's best for most reefers to just buy it and not risk the safety.
When I was younger, I worked in a lab environment, so that has translated well to reef DIY mixing. Now, I play the mad scientist at home...and for trace elements mixtures, it's like 99% water anyways.