Dosing help!

[Surferpat]

My favorite most helpful LFS closed and I'm having some issues with dosing calcium and alkalinity on my own! I dose a 2 part daily in my reef tank. My alkalinity is at 8.5 dKH (right where I want it) but my calcium blew up to over 500 ppm! I need to lower my calcium (I'd like to hit the 400 range) but keep my alkalinity where it's at and I always have a hard time figuring out what to do in this situation. I currently have my alkalinity dosing 17ml a day and my calcium at 18ml a day..... what should I drop or raise and to what? I know there is no "perfect" answer but a general number to help out and retest in a few days would be great!
Thanks in advance!

 

[MaddyP]

I would keep the alk where it is and turn the calc down to 2ml. Calc should drop naturally. When it gets to around 400, start upping the calc dose until it stops dropping.

 

[Randy Holmes-Farley]

There's no good way to reduce calcium and just not dosing it is the way to go unless it is crazy high (say, 800+ ppm). 550 ppm calcium is fine, so over 500 is no biggie.