Can you mix chemical medias in a Next Reef MR1 Media Reactor?

the calcium media wouldn't do much in the reactor. If you are planning on using it like a calcium reactor you would need the co2 tank setup and all the extras to do that. The phosphate media is used to trap phosphates not add them. I doubt that it would react, but the calcium just bein in the reactor will do nothing more than having it sit the tank. If you are trying to supplement calcium, there are better ways of doin it. Kalkwer drip, liquid or powdered calcium, or a two part calcium system. I don't know why you would add both though, use if for phosphate reactor and add calcium so other way.