You should always use Hygrozyme, Roots Excelurator and Great White Mycorrhizea. Consistent water temps with bi-weekly cleanings will ensures a healthy reservoir/root system. You may also want to look into using Drip Clean. I have had optimum success in all mediums with this combination.
The smell is definitely from the algae and the water temp. You may need to invest in a water chiller/heater and possibly upgrade your air stones if you are unable to manage your room temp easily. Your discoloration sounds like a chemical reaction from your nutrients and your ph level. Your water temp is important when trying to control ph levels. If your temp is all over the board, so is your ph more than likely. Especially if you are on well water.
As for your Bubbleponics system, I have had only second hand experience with these and they proved to be very difficult to manage ph and ppm. The bubbleponics system has 1-2 refill or main reservoirs and a water level regulated feeding reservoir for every 6 plant sites. Meaning you have to ph and ppm every res separately if things get all out of wack. If you have more issues with this system, you may want to consider DWC or Ebb and Flow. You can easily convert to DWC with your existing setup.
Anyway, I hope this helps.