aero garden hps grow speaker

alright so im 99 percent sure that im gonna do this plan and just to let you know im not using the aerogarden lights cause obviosuly their shitty so im using a 250 watt hps but the aerogarden light will still be put to use it will ba attached to the back wall of the box
so heres the aerogarden space saver i will be using

and here is the fan

and here is the 250 watt hps with ballast


and here is a fan/ air circulator

and a digital thurmometer

and a very rought blueprint

I need help with your help! I recently purchased one of those aero gardeners but I have the smaller version. I planted about 6 white widow seeds only 2 sprouted up. Then about 2 weeks later I started to see root rot. I don't know what I'm doing wrong! Can you please break everything down for me like how much water to use to what type of lights and etc. Thanks

add airstones to your aerogarden to avoid root rot and the dude who is usin the 250w hps just skip out on the aerogarden and make a rubbermaid dwc it will give you more space for the plants and roots