Maintaining Alkalinity

[Baldy]

Hello all,

I have had my 75g running for 4-5 months now, with great success so far! I have 2 true percs that seemed to change colors, and much to my delight ended at a nice black on top fading to orange on the bottom color. As well 1 blue/green chromis (bad experience and ended up losing a few others to a cycle in the Q-tank, ans well as powerheads , and the new addition, a one spot foxface that is getting fatter by the day.

the corals are also doing good. 1 colony of emerald palys, a bunch of kenya trees, 1 group of zoas that ive had for a couple months and 2 newly added zoas.

my question is about the best method for maintaining alkalinity. The h2ocean salt im using mixes out to 480ppm calcium and 1400 mg, so with regular 10g per week water changes, i have never had to dose either. but alkalinity is a different story. thus far ive been using seachem reef fusion 2 to raise the kh when it drops below 7-8. from what ive read, the 2 part systems are supposed to be used together though. I have been toying with the idea of trying kalkwasser, but from what ive read that also raises calcium, for which im not in need of.

would it be ok to continue using just the alk dose of a 2 part dosing system, or is there a better way?