Hey guys, I got an RCS shrimp tank and I need to raise the TDS/gH. What would be the safest approach to gradually raise this?

1. Add Salty Shrimp gH+ to the tank water gradually over a few days?
2. Premix my RO water at values close to my current TDS and add it during water changes?

Current Params:

TDS 68
pH 7.4
gH 5
kH 6
Temp 72

Other info:

10 gallon
0.6 BPS CO2
6hr photoperiod
Heavily planted

**Seiryu stone was recently removed from tank. Leaching calcium was affecting gH/kH

Sorry in advance if this has been answered already.