Nothing right now.. I just dose Kalkwasser from my auto top off and pour in about 30ml each of B-Ionic a day. CA reactor and a chiller are my next major purchases.. next month with the tax refund. I want to get the WM reactor but people in my club tell me I am crazy, it is way too much for my tank. Which they are right, it is rated for 300G, but it is soooo cool. 3 chamber, one of them is a built in phosphate reactor. I think it is going to run $375 for just the reactor, then you need the CO2 bottle and regulator.
The PM one is what 90% of the people in my club have and swear by it. It is better suited for my size tank so I will probably go this route.. I just like new things on the market, especially from well respected vendors with Warner Marine.