It might cloud your water slightly for a day or less depending upon how much calcium your system needs, and how good your filtration system is. Some people experience no clouding; by putting the product directly into the filter intake in a gradual way over a few hours. To have a truly soluble calcium carbonate, some clouding is inevitable.
Treated water can be added to the aquarium immediately after mixing with Fritz A.C.C.R.
Not directly. However, they do consume organics that become nitrates in the aquarium, this slowing the accumulation of nitrates.
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