First time growing in Tent + pics guidance input apperciated!

Attachment 284704 Attachment 284705 Attachment 284706 Attachment 284707 Attachment 284708Hey in about 2 weeks or so with growing tent just under a meter wide deep and 1.6 high... 6 in exhaust fan (ducted out man hole with fan controller at "max) 250w mh hid(on 24/7 about 6 inches as close as possible pretty much trying 2 keep around 22-25 degrees small xbox fan for air in take sucking air from in room small fan blowing above the planter under the light.. here are some pictures.. just a little concerned been buying bottled water 2 feed plants don't have Ph tester and at start i feed a couple days with small dutch master Veg solution ( i know it was 2 early to do so, now). problem I'm having is my leaves are looking bit yellowish but healthy i did have low humidity like 20-30% so i boiled kettle in tent till reached 50%... just concerned i'm doing something wrong cus my leaves are going very yellow could this be a PH problem or because i used solution 2 early i some how locking out the nutrients from the roots? Been watering once everyday cus my exhaust up full humidity normally drops too 20-35% and soil drys up quickly plants in little plastic cups. soil is potting soil with some Perlite temps stay around 22-29 drops a little lower at night. Any pointers help info so i make this happen right would be grateful thx! please post your thought opinions and pointers