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OK I measured the res. It's at 100 ppm and a pH of 6.06. I think I can probably up the nutes, as they're now 3 weeks old, right?
Elle, I tend to read the plants more than the meters. What sort of colour are they looking?
5.8 ph is the sweet spot, but it's good practice and easy in the wilma to get a bit of swing. The various nutes are more soluble at different ph, so a bit of swing allows for better uptake. Because of the way the plants take up the nutes, the ph creeps up in veg and down in bloom. So aim for say 5.6 in veg and it'll drift up and about 6 in bloom and let it drift down. You will most likely have to assist this a little veg when the plants are smaller.