PEACE Thanks for the kind words (the girls are all giggly. They love taking pictures.....they seem to look their best when it's time for pictures
). I have been trying to do my best and I am proud of my small attempts at growing. I am learning and applying all the knowledge that I can acquire to make them the best and healthiest that I can.
(BTW the yellowing on the leaves of yours may be due to a potassium deficiency..I can't be too sure but I believe that could be the case there) What you may want to do is to flush the grow cubes that you are using with straight water and only allow water for them for a week to see if it can be cleared up. then you would add the nutes (at a 1/4 strength until they are readyto get a bit more. I am NO EXPERT OR GURU NOR DO I CLAIM TO BE A WEALTH OF KNOWLEDGE ON THE SUBJECT I am however a new grower and I love this. Therefore I want to assist in any way that I can , if at all, to possibly help the next man/woman on their grow attempts.
The following is an little on the Potassium problem and what to do to fix it. As I stated it is only to assist you and not to be taken as law. I don't know what the problem is specifically, but i do know that it is something and it wouldn't hurt to flush them anyway (which is what any deficiency or toxicity is going to need to get right).......
Potassium (K)
Potassium is involved in maintaining the water status of the plant and the
tugor pressure of it's cells and the opening and closing of the stomata. Potassium is required in the accumulation and translocation of carbohydrates. Lack of potassium will reduce yield and quality.
Potassium deficiency (K).
Older leaves are initially chlorotic but soon develop dark necrotic lesions
(dead tissue). First apparent on the tips and margins of the leaves. Stem and branches may become weak and easily broken, the plant may also stretch. The plant will become susceptible to disease and toxicity. In addition to appearing to look like iron deficiency, the tips of the leaves curl and the edges burn and die.
Potassium - Too much sodium (Na) displaces K, causing a K deficiency. Sources of high salinity are: baking soda (sodium bicarbonate "pH-up"), too much manure, and the use of water-softening filters (which should not be used). If the problem is Na, flush the soil. K can get locked up from too much Ca or ammonium nitrogen, and possibly cold weather.
Potassium (K) Toxicity
Usually not absorbed excessively by plants. Excess potassium can aggravate the uptake of magnesium, manganese, zinc and iron and effect the availability of calcium.
The following pix are from the source of the info as well.
PEACE