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By the way, while I'm doubting the Fuel would have enough organics in it to actually cause this, it is true that the breakdown of food to ammonia and then to nitrate consumes carbonate, which obviously factors into alkalinity in a seawater system. In theory you get the alkalinity back if bacteria in your system reduce the nitrate to nitrogen gas, but it's not uncommon in reef tanks for there to be little of this nitrate reduction. That shows up in an imbalance of alkalinity to calcium consumption, since some of the alkalinity is going towards oxidation of ammonia to nitrate.
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