get a real ph/ppm tester those test strips aren't going to cut it. That cabinet won't be big enough, the rubber maid will take up a foot, and the light with the hood will take up around a foot, so you are left with only 12 inches of usable space... Plus you could build your own hydro setup for a 1/4 of the price.

I have just harvested 1.5lb of Arjan's Haze #3 and it is the bomb. It really stays short but is totaly sativa and you can tell when you smoke it. Try and leave it for one week after you think it is ready to harvest. You get much more resin. I flushed for 2 weeks at the end and it is burning nice grey ash.

that system is only good for very small plants i had that one and my plants outgrew that shit in 3 weeks i know its cheap but invest properly or dont waste time with the bullshit