I started 2 part dosing back in September or so I think? I use the BRS 2 part system - it is far more economical (and very easy) to make your own solutions rather than buy premixed solutions, where you are paying for 90% water. I also use the BRS perastaltic dosing pumps and some digital timers to control them.
The whole system is pretty much fire and forget. It takes very little maintenance. If I had to add measured amounts of solution each day by hand, I'd never do it. With this, I just have to fill the reservoirs under the tank with 2 part solutions every 5 weeks or so, and thats it. Though as I said lately with the SPS
getting bigger, I have had to make weekly adjustments to the timers because my tank is requiring more and more solution to keep Ca
I experienced an explosion in coral growth and health when I started the 2 part system. Keeping Ca
stable really seems to be have benefited my tank.