Water Changed...

Shortly after coming up with my replacement water recipe and then testing it, I performed my weekly water change, removing 4.0 gallons and adding back 4.0 gallons of the replacement water. I tested a water sample collected from the aquarium from before the water change. Below are the results:

Pre-Water Change Sample

Test	Results
NH3 (ammonia)	0 mg/L
NO2 (nitrite)	0 mg/L
NO3 (nitrate)	5-10 mg/L
CA (calcium)	2 drops = 2*20 = 40 mg/L
PO4 (phosphate)	0.25 mg/L
FE #1 (toxic iron)	0 mg/L
FE #2 (chelated iron)	0 mg/L
GH (general hardness)	6 drops = 6*20 = 120 ppm = 6.72 dH
KH (carbonate hardness)	12 drops = 12*10 = 120 ppm = 6.72 dCH
pH (high test)	7.8 pH

The pH is high, the pH is high... but so is that stupid carbonate hardness. Am I still paying the penalty for adding the baking soda that one time? Probably.