What Is A Good Ppm

Hellow fellow growers my sexy girls reache 1 week from sprouting 2maro. Here are some pics. My ppm is 350 and a ph of 5.9 Does this sound good?
My res for the hydro grow in rockwool cubes is a mix of tap water and distiled about 50/50 and a 1/8th nurient solution. Baby amounts does this sound good or is 350 2many?

I keep my cubes in a dome and mist them when needed. when roots show I transplate to my buckets.

no nutes for 2 weeks after germinating. give the nutes as directed when you transplant to veg stage. lights 18/6.

thanks for the advice man any others.???