dead coral = calcium?

[marlinmero]

I was cleaning my sump the other day and decided to take my calcium reactor out and clean it all up. had a lot of sand and junk in the bottom of it. as i was putting it back together i was thinking it would be nice to add some calcium while its out. then i remember i had a box of old bleached out coral. So i smashed it into marble to.25 cent size pieces and added to the reactor. This should work and be ok shouldnt it?

 

[Herefishyfishy]

Dead coral skeletons are basically aragonite which is CaRx media. On question would be phosphorus and or organic levels