If you are swinging blindly and missing the target then you need to apply a broad spectrum approach. To begin, most critters like to eat fungus, decay, and algae at some point in their life cycle. Cleaning dead or dying matter out and sterilizing the root zone with peroxide or Zone, will start to starve many pests. Next, I would definitely use a systemic approach such as azamax and apply from the top as well as letting a soak of the roots and tray. Sterilize pumps and any potential places to hide. When the lights are out, you need to spray spinosidad thoroughly. This along with dunks, and you have made it a very hostile place. This combination is great for mites, thrips, gnats, and many other common pests. Do not overuse these products as resistance will develop, but 2 applications 7 days apart is smart.