Different answers if they are different seeds though, I thought we had identical clones. Then it's just good old genetic tomfoolery. If not:
When water is left exposed to air, it absorbs carbon dioxide, which reacts with the water to form carbonic acid, slightly lowering the water's pH and potentially altering its taste.
Carbon Dioxide Absorption: Water naturally absorbs carbon dioxide (CO2) from the atmosphere. The absorbed CO2 reacts with water (H2O) to form carbonic acid (H2CO3). Carbonic acid is a weak acid, and its formation leads to a slight decrease in the water's pH, making it slightly more acidic.
Was the bucket clean? Was there anything in there that could cause a reaction?
Tap water composition varies depending on the source and treatment, but generally includes essential minerals like calcium, magnesium, sodium, potassium, and trace amounts of others like iron, zinc, and manganese, along with chlorine for disinfection. When chlorine, used as a disinfectant in water treatment, reacts with organic matter (like decaying leaves, vegetation, and other substances) in the water, it can produce various byproducts, including trihalomethanes (THMs) like chloroform, Chloroform will not burn off. Can be harmful to plants, causing damage like brittleness in roots and chromosomal damage,
Looks more like whatever you fed the plant on the right was broken down into a more digestible form before feeding. Possibly uptaking nutrients faster, which could explain enhanced growth and earlier signs of deficiency. The only thing that affects the speed of uptake is how small the nutrients are broken down,(Given transpiration is the same) cannabis plants are old grannies with false teeth that like to eat on mashed potatoes.
Water absorbed CO2 altering PH casing different reactions releasing nutrients at an accelerated rate compared to other plant.
Gluck.