in an allready setup tank, with good filtration, good biological filtration, and weekly water changes say 50% would discus thrive. why is it so important that discus have RO water. my tap water is very hard and i know discus like hard water. but would chlorine etc that normaly is harmless to fish in water changes be harmfull to discus?
55US Gallon Medium Planted | 36x15x24Tall
PH 7.0 - 7.2 GH 11
Ehiem 2232 Thermo
2.7WPG 160W 10,000k 5xNO T8's
Sand+Eco Clay, CSM+B Baby Steps + Pres.Co2