hey will how many gallons is your complete system?
have you ever considered driping kalk insted of any type of reactor?
ive had a ca+ and didnt like it very much.so now i just drip kalk by brightwell useing a aquadrip from kent and my 120g system does perfect.
good growth (sps,acans,chalices,and zoas)and coraline on my rock and back glass.