Humidity while in veg should be a little higher, maybe around 40-50 you can add rolled up wet towels etc to raise it.It never seemed too important to me ? When you switch to flower you should be a bit lower 20-30s so you don't have to worry about mold etc. Water temp mid 60s is great too warm and you could get a little algy. What kind of water are you using ? My tap water has a very high (580) ppm so I use bottled drinking water (about 1 dollar a gal) so I start off with about 75-80 ppm . I use Advanced Nutrients sensi A and B with a little big bud so far so good . I just follow there data and am about 1200 ppm in my 3rd wk of flowering !!