it looks like there is algae choking the roots of your plants and eating all the delicious nutrients.

your reservoir needs to be light-proof, buy a roll of metal tape from home depot (should be near the ducting) and tape up every inch of your res until it is PITCH BLACK inside, even (especially) the top, anywhere you can see blue, needs to be taped.

I've tried duct tape, spray paint, black plastic.. the metal tape works by far the best, and it keeps it insulated (probably).

should solve the pesky algae problem... also throw in a few mls of that Hydrogen Peroxide daily to kill algae while you procrastinate
macro Reviewed by macro on . DWC still having trouble's. Need Help ASAP Ok. I am using a dwc system with two flourescent dual spectrum 65 lights. It has a 6 gallon resevoir. I am using tap water with a ph of 7.5. Also i am at 12/12 lighting right now. I am also using an organic micro and bloom. Last week i had a problem trying to get control of allgae. I flushed my whole system, water lines, air pump and the air disk yesterday. Now today when i went to go check on them this is how they looked. The ph is 5.65, water temp at 68 degrees and the air temp about 74. Rating: 5