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- Oct 13, 2016
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My 110 gal tank is a few months old, and pH was around 7.6 and alkalinity around 5-6 (Tropic Marin Pro). I'm trying to raise my alkalinity and pH by dosing baking soda (in RODI). I've gotten alkalinity up to about 8.5 (pH is about 8). Alk goes up by about 0.5 dKh after I dose, but then over a day or two it drops back down. Everything I've read about alkalinity is the context of replacing what corals and coraline consume, so I don't know what to expect when there is none. The only inhabitants are two small clowns. There's a little bit of very pale red macroalgae in the refugium, but no other algae and no coralline. What might be causing the alkalinity to drop?