Yeah, MH is veg and hps is flower.
Why are you getting a ppm meter if your growing soil?
And hydro has a ton of advantages over soil, provided you can keep your water temps in range. Just not having to haul dirt, fill buckets and dispose of dirt makes hydro worth it (you can grow a fullsize plant in a 2" netpot with only a rapid rooter). I'd only recommend soil if it's so hot you can't get your res. cool.
Why are you getting a ppm meter if your growing soil?
And hydro has a ton of advantages over soil, provided you can keep your water temps in range. Just not having to haul dirt, fill buckets and dispose of dirt makes hydro worth it (you can grow a fullsize plant in a 2" netpot with only a rapid rooter). I'd only recommend soil if it's so hot you can't get your res. cool.