See the non CO2 water column article on my web site, it will give you a general rate to use, you might use it at 3x that rate if...........you use Excel, since the HC will take over most things unless you trim it back aggressively.
Cherry shrimp are tough as nails, you will not kill them with KNO3.
Not unless you get up at the 100-150ppm or higher range.
For CO2 enriched tanks, there is an increase of growth by 10-25X depending on species.
So you can take that figures and divide by 10/20X etc, but you can also only dose once a week or skip a week here and there to reduce it back down.
The frequency can be less since the rate is also less.
So daily or 2-3x a week is not required.
Here is such a tank using the non CO2 water column method:
Adding ADA As or MS to such a tank will make it it even easier, and you could error on the lower side for water column dosing and get away with even more flexibilty and better growth.
Try that on the next nano you do.