2 week old

Red line down midrip, oxygen-deprived, oxygen is essential for phosphorus uptake in coco coir because it's crucial for plant root respiration, a vital nutrient for a seedling because it is needed for early root development, energy transfer, and cell division, requirements for good germination and vigorous growth. Phosphorus will leach in runoff in coco coir because it is water-soluble and highly mobile. Roots can only pull where they can reach; water is not moving fast enough. Holding 70%rh 24/7 over time will reduce water movement to almost zero, crippled the respiration of the plant, and prevent reoxygenation of the medium if the moisture goes above point. It's not that she is not growing, she is lacking oxygen/phosphorus at early stages for various reasons, what is optimal for rapid growth does not give two shits about moisture retention of a medium, and the importance of keeping water moving in a timely manner from one medium to another is important. Oxygen moves more slowly in a medium saturated with water because water is a denser medium than air and hinders the diffusion of gas molecules. Diffusion rates are significantly slower in water compared to air, with the diffusion of oxygen in water being about 10*4 times slower than in air. As soon as the soil moisture level goes over a point, it accumulates/holds moisture, and the countdown begins. Oxygen no longer moves. I understand there is coco with perlite, but holding such a high ambient rh day and night without a dry period to perform some ET then oxygen will become deprived very fast. There is oxygen in the perlite, in the coco, but it moves so slowly when oversaturated it's almost like............... a traffic jam, there are roads, there are cars, but nothing is moving! Oxygen is like the white ball on a pool table you need it to oxidize and assist in the breaking of other molecules, ripping atoms apart in a medium, feeding micros, feeding respiration. Keep RH at 50-55%. High RH causes more problems than it solves most of the time, without understanding how it affects water movement as a whole between different atmospheres. She needs P, she needs Oxygen, and water needs to move faster. The faster you move water, the less you need to worry about oversaturation; the slower you gear the plant through transpiration/evaporation, the more accurate you need to be with how long water sits in a medium and how much. Until a plant's root systems are big enough to fill a pot and can be relied upon to perform all the ET on its own, then you can go high RH 24/,7 but until the roots fill the pot, you must incorporate at least some evaporation time for the medium and create a dry cycle; otherwise countdown begins. The roots use pressure to penetrate soil and grow, this pressure comes from turgor pressure, turgor pressure comes from osmosis, osmosis is primarily driven by rate of transpiration, which is dictated by temp and humidity, when you run 75F 70% you are giving the plant a tiny amount of pressure to work with therefore very little pressure to penetrate and dig for nutes in dire times. Can't find that P that leeched down to the bottom of the big ass pot that takes the seedlings' roots 6 weeks to fill. No oxygen, no P, no cellular respiration, no ATP, slow everything else. A lack of phosphorus (P) early in a seedling's life can permanently stunt its growth, leading to a reduced final yield even if P is supplied later. glcuk.

it's starving... tap water for coco'd be 200-300 ppm (u add CalMag to this value) then u add 150-200 ppm of veg fert in sum'll be 350-500 ppm and u water it beneath stem and around +1 cm etc u do this every watering, preferably with 20% runoff