03-24-2013, 08:00 AM
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Go get some independant Cal and Alk kits. They aren't incredibly expensive, like maybe $25 for both. Or order online for cheaper.
The effects of low Calcium and Alkalinity on the system can be associated with the low pH in tank 2 (even tank one can use a few points basic). Products like pH up and other reef pH balancers are strictly an Alkalinity buffer, usually calcium carbonate. This is why it is so important to test these two parameters.
What are the rest of your tests saying (in ppm)?