oOKkay...This way is much clearer:
dKH = 1
dGH = 17.9
pH = 6.1
It will help if you provide more info on plants, tank size, lights, trying DIY CO2? etc.
If lights are strong enough plants' chloroplasts are able to make plant sugar/energy from carbon in solution (depending on plant requirements this translates to having preferably higher alkanity).
Floating plants are able to get their energy from carbon dioxide in air but also benefit from carbon in solution as carbonates, organic soil, etc