Quick PPM double check Question

Good thread as I just ordered the two part solution from them also.
I know tangster runs his high also... like 15 dkh...
here is a recent post were he keeps his numbers.

http://www.3reef.com/forums/filters-etc/calcuim-build-up-58004.html

 

I personally shoot for:
450 CA
1500 MG
13 DKH (not anywhere near that right now )
For optimal coral growth

 

I thought that I've read that coral don't necessarily use more alk/ca just because there is more present in the water. More will precipitate out when the levels are higher but it's not necessarily helping the coral to build skeleton faster.

I'm no expert though, and don't have that source handy, I believe it was a reefkeeping.com article or advancedaquarist.com or something like that.

EDIT: Hopefully this isn't too off topic, I believe the OP requested "comments" on the dkh level of 12 so maybe this discussion falls under that.

2nd EDIT: I couldn't resist trying to track down a source, if only to make sure I read/understood it correctly. Here he talks about dkh over 11 leading to increased precipitation of calcium carbonate on tank equipment, which I would like to avoid if possible. Doesn't mention coral calcification rates though. I guess that's another issue entirely.
http://reefkeeping.com/issues/2007-04/rhf/index.php#6

3rd EDIT: And here is a mention of alkalinity rates actually increasing calcification (towards the bottom), not necessarily calcium levels though.
http://www.advancedaquarist.com/issues/apr2002/chem.htm
So I guess based off of that higher alk sounds good if you don't mind dealing with the precipitation. Of course that only being 2 sources and written by the same guy, not set-in-stone by any means.

 

Thanks screw tape. Your comments are most welcome. I believe after you factor in the Mg, the precipitation concern is mitigated as the Mg keeps the Ca in solution. My Mg goal was 3.25 times my Ca goal - a value often cited here in the 3reef threads.

 

I believe proper Mg levels are taken into account in the article commenting on precipitation due to alkalinity levels higher than about 11 dkh. It's not the snowstorm precipitation but a slow accumulation on heaters/powerheads/pumps etc which requires more maintenance in the long term.