i understand that the levels need to be right and the reactor will keep them there and i havent bought a reactor yet.
there are a lot of reefers out there that have a C reactor and then down the road, as the corals grow, they end up buying a K reactor to keep the levels where they need to be or they dose lime water(Kalk) to keep the levels up.
maybe im a bit confusing or im not asking the Q right, or something
Jay