jt3069 wrote: I would like to keep my calc around 460-480 and my alk between 8-10...
IT WILL BE HARD TO KEEP SUCK HIGH CAL, AND IF YOUR NUTRINETS ARE LOW YOUR TANK WILL LIKE ALK AT 6-7 ANY MORE AND YOU COULD CAUSE RTN OF YOUR SPS
That only seems to happen with organic carbon dosing and higher alkalinity, not necessarily low nutrients. The mechanisms aren't really clear, either. In the absence of organic carbon dosing, higher alkalinity works just fine and can increase calcification rates, since it is typically the major limiting factor in the whole process.
As far as what I dose for calcium and alkalinity, it tends to be a bit of everything. I only use kalkwasser while my protein skimmer is online. The best thing about it is that it is a comprehensive supplement and only needs one pump channel. However, with the high photosynthesis in my tank, if I dose it without aeration from the skimmer, pH climbs into the upper 8 region. If the skimmer is off and levels need to be bolstered, 2 part comes in handy. I also use dry baking soda and anhydrous calcium chloride for the occasional boost. Magnesium is sparingly dosed, though it rarely depletes in my system, due to relatively low demand. Alkalinity is, by far, in the most demand due to the carbon needs of my seagrasses.
The kalkwasser is dosed via a spectrapure UPLC, which keeps everything topped off. I used to utilize a liter meter + 2 channel pumps for 2 part, but the demand is low enough now that manual dosing every couple of days is sufficient for that.