By the way, before i use mmp product or RO water. I just use my tap water mix with few drops of prime and seat there for few days before i use for wc, i also mix with seachem equilibrium to boost gh and tds to about 140-150. .
My tap water without mix anything, ph 6.7- 6.8 , tds is 11 only.
If i just use tap water like mentioned above, yes Those crs/cbs got babies fine..
However now i start use Ro and mmp product ... So i am not sure the right way yet