delteck 501 help

[boots]

now that I have my reactor running like they say it should ph 6.5 inside reactor, i find that my dkh/ca levels have gone way up.
My ca is at 450 ppm/dkh is at 11 is this cause for concern I have been monitoring it for the past few days and it seems to be stable there.
Or should i back off my bubble count to 1 bubble every 2 sec. to bring the ph down so that it is not dissolving so much media