My Converted Bathroom Growroom

Hi, i have recently converted my on suite bathroom into a grow room, have 8 HULK plants and a feminized NORTHERN LIGHTS, K2 and WHITE WIDOW in the germanation box ( as shown in pics ) havent purchesed HPS yet so currently using florescents, and using plain bio bizz medium , i am new to the whole growing game and would like some advice what you think i should possible purchase,, install,, change, or do next with my grow setup ?? thanks

looks like a nice little startup man ....
as for advice, where do you think you'll be flowering? of course you're going to want an HPS at least 400 watts for a decent yield. if you can put em in a corner somewhere i would also tell you to get mylar to cover the walls with, so that you get as much light to our plants as possible.

aaaand if you don't have one, get a pH meter/ppm reader...or at least pH papers so you can make sure you're giving your ladies water that is properly acidic, it'll save you a lot of headache! good luck