Baking soda only temporarily lowers pH, and only fractionally anyway. You can buy alkalinity supplements from the LFS specifically designed for aquariums. Some people argue that they aren't any different from DIY recipes, but I've heard the odd horror story from DIY recipes and can't really think of any from aquarium products. For a small tank, cost isn't much of an issue anyway. Your calcium is rather high...are you dosing anything for it? What salt mix are you using?
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~ Mindy
SPS fanatic.
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