Well, I don't want to start any wild discussion or advertise in this thread now, but I have been using some stuff from Fauna Marine which seems to be like the new RS reef care stuff. Just from my experience, I am using their stuff along with their provided caculator to dose Ca, Mg, adjust dHK, add nutrition, base elements and so on, and works great. I haven't compared prices here in Germany yet, but 1 litre of the stuff I use is about $22 and from the links posted here, the ingridients are pretty much the same. And 1 litre for the 130D tank is going to last very long since I tend to under-dose abit considering I only need like 10-20 mLitres daily or even less.