Assertion: calcium ion's number | /r/UsedFor | discus
Facets:
Source sentences:
text: The discus under my care were much more healthy with a KH of around 50 ppm and often higher, a GH around 100-200 ppm and also often even higher, and a BALANCED Redox Potential that allows for both oxidation AND REDUCTION than with a pH of 6.5- 7.0 (please note that these numbers just given are for discus, for many fish such as livebearers I kept a much higher KH and GH).