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John I've been having the same pH problem with my tank, I'm dosing the DIY 2 part Alk & Cal. I dose Cal when the lights are on and Alk when the lights are off.
last night my pH was 7.86 @ 10:00 and this morning pH was 7.64 @ 6:45.....Rob was telling me about how stables his parameters has became...
Tank is 12 weeks old today and everything is doing very well, I'm trying to keep up with the weekly 10 to 15% water change.
Since I setup the tank the new additions are:
Trio Lyretail Anthias, Rainbow Bubble Tip and Rose Bubble Tip Anemones, pair of False Perculas Clownfish and a mini colony...
Same thing was happening to me, when I was buying fishes from a local pet shop, fishes only lasted alive on my tank for not more than a week.
I found out later on they keep the salinity level low to avoid sickness.