20Gal, initially 8 guppies and 1 pleco, now 6 guppies. Tank has been set up for 3 months.
I use this test kit- https://www.amazon.ca/EASYTEST-Aquarium-Freshwater-Accurate-Carbonate/dp/B09MYP96GT
It reads nitrate, nitrite & chlorine are 0, hardness 75, carbonate 80 & PH 6.8
Normally i do a 25%...