What calcium reactor media do you use?

[childress5tyler]

As the title says, what calcium reactor media do you use?? And what size??

 

[Reefing Madness]

 

[AZDesertRat]

Aqua Medic Hydrocarbonat in the medium size. ARM seems to be very popular too.

 

[ReeferBee]

I use reborn, lots of folks use ARM too