I would bump it up to 800 ppm's for now and the next water change after that about 1200. If you see leaf tip burn back off just alittle by taking some water out and adding ph water.

What nutes are you using ?
LOC NAR on probation Reviewed by LOC NAR on probation on . Nute Question Judging from the size of my plants, Would you increase the PPM higher than the 425 PPM ia currently running? I know one of them looks a little scrawny, but I have hopes for it yet. Rating: 5