I purchased a very small dwc tub system and the plants are dying. Iv'e tried multiple warm nutrient baths, peroxide and several flushes and nothing seems to be helping. I dont have enoufgh power to run multiple aquarium heaters, so the water temp. is a little cold. I made a 30gal. version of the tub system and there all doing excellent. I recently added some un-sulfered and un-salted molasses to the tubs so mabey the molasses solidified? or is this simply root rot?