Bro, if you want your plant to be shorter - just lower your lights, keep it i'd say in 30cm from tops. This will make your plant more bushy and shorter. LST new branches only.
Now about bactor: man, why you are using soil bacteria in hydro? That brown stuff is dead bodies of your bacteria. You must to clean everything now, take sprinkler and clean the roots, all reservoir and change the nutes. That dead mass may cause you serious problems...
Also read about symbiosis basics and michorizae stuff.
Also one more thing - million bottles wo'nt make any miracle. You must EXACTLY KNOW what you're using.
Do not be mad at me bro, im just trying to help you to find a way in hydro, which is really good option.