As much as I am a big fan of the TLF 2-part, I wouldn't reccommend it for a tank your size. As others have mentioned I would suggest you buy bulk chemicals to dose calcium and magnesium, and then buy something like the SeaChem dry buffers for alkalinity. It will be much, much cheaper this way.
Calcium, alkalinity, and magnesium are all linked together and you will have troubles raising any one and keeping it steady without raising the others. Your best bet is to start doubling or tripling your dose until you get your numbers up higher.
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~ Mindy
SPS fanatic.
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