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Hydro solution smells... bad ?

Greetings All.
 
I recently started another hydro grow in my tent. Here are the details>>
 
2.5 x 2.5ft tent.
2ft 8 T5 LED (used when plants are small). Then move to a 315W LEC
2 bucket DWC system. One for grow and the other for "maintenance". 6 gallons total liquid volume.
Nutrient chiller. Nutes kept at 68 DegF.
Two air pumps and 4 air stones. 2 stones in each bucket.
 
I have plenty of circulation and plenty of bubbles.  I've done this before with great success.
 
Here's the deal.  I started the system up about three weeks ago. At first I just ran 100% tap water through the system. I let this run for a few days.  I then topped of the rez with tap water, adjusted the pH to 6.5, then added General Hydroponics "Maxi" series nutes.  I've never used this product before.  I have always used the  GH Flora series and never had any trouble.
 
So then after a couple days I was checking the pH (was 6.1) of the solution and I noticed a bubbly foam on top of the solution. That, plus a smell that I've never had in my reservoir. It was a swampy smell. It  smelled something like a sewer. Well obviously that is bad.
 
I drained the entire system of the solution, then I refilled with tap water. I added about 1/4-1/2 cup of bleach. I used a sponge to wipe down every surface that I could get to with the bleach solution. I let the bleach run through the pumps and through the nutrient chiller for over and hour. Slowly, I rinsed away all of the bleach solution. I 'think' I cleaned it really well.  I used to "brew"... not that that makes be an expert.
 
I refiled the reservoir, adjusted pH 6.0, and added nutes.  Little more than four days later, the smell is back.... and so is the foam.
 
I revisited the smell. It doesn't really have a "rotten" smell. It has a swampy nose to it for sure, but it smells more like compost than.... @ss.
 
So for know I'll let it run for a while to see what happens. The seedling I have in the system doesn't have significant roots yet, so it isn't in contact with the nutes. I can move it anytime.... for now.
 
Interested in any comments.
 
Happy Growing,
 
Jeff
 
I always like to add a capful of hydrogen peroxide to the tank, just in case. Its an awesome product, use it in the laundry 1/2 cup per load, as mouthwash (1-3 times a week at 1/2 strength) I think some countries are starting to use it in water treatment plants in place of bleach. Cheers!
 
I used to have problems with the otherwise good GH FloraNova Bloom...brown slime/smell and foaming inside due to light leakage....how light proof are your reservoirs/piping?
 
I have a pump that transfer 20 ml of 3% food grade H2O2 everyday in my 20L DTW reservoir. No more smell...foaming and brown sludge. Plants are happy with the extra dissolved O2.
 
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