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Do you mean for clones? For veg? For flower? For soil or hydro? Lots of variables u need to give me so i can point u in the right direction. But im happy to help! :)

Yes clones and the first 2 weeks. I use 6.2 atm .

Thats perfect. Thats what i use for hydro clones. Make sure to keep your ppm low with clones or you can burn them.