Ok I tested all parameters and here they are, up to date.
Also put in some fresh active carbon in the filter...
TDS: 270ppm (tap water is normally 400TDS)
GH: 11 dGH (tap water is normally 25 dGH)
KH: 0 dKH? (tap water is normally 8 dKH)
Obviously things have changed a bit. KH went back down to undetectable. probably the substrate's doing. pH went back down to 6.5...a bit low, but hopefully the cherry shrimp can deal. it looks like the substrate lowers the tap water's KH GH and even TDS...crazyness.