Set back

it looks like you've misinterpreted how to water a small plant in a big pot. it's not just a ring.. you water inside the ring too. make sure it gets all the way to bottomm sos that roots grow in proper direction. These improper watering habits could be part of the problem. fix that first, see how it reacts. regardless, look like a nitrogen deficiency and something else coinciding... so double check pH. if okay, bump nitrogen and something causing the new growth to pale from insdie out - maybe S deficiency. your watering habit is likely a part of what is going on here.

Feed your plants dude. I had a look at what your feeding them and if it's accurate (Velokelp and Nature's Candy) thats not good enough. Those plants are starving. You aren't providing them with any decent source of N-P-K and no micro nutrients using only those 2. The kelp has a 1-1-1 N-P-K but obviously it's not cutting it. Judging from your plants size they are about 1 month old. 250 PPM isn't enough. Get yourself some remo grow, bloom, and micro and start mixing that up, in addition to what you are using now, with a 5.8 to 6.2 pH. They will light up pretty fast with greening up and growth. Careful not to over water at this stage because they are working on establishing a root system. There's a reason growers incrementally move up in pot size rather than planting a seedling into a 5 gallon container. That is often why in the beginning stages of your plants that are grown from sprouted seeds, they pop up and display their first set of leaves, and then seemingly stop vertical grow and leaf production. That's normal, because what is growing during that time is happening under the soil. They burrow a tap root in the beginning and then branches of roots sprout from there, and furthermore the roots develop fine hairs which are what actually absorbs water and nutrients. I hate AutoFlower plants because they apparently are stunted by transplanting. And they serve no real purpose for indoor growers to use them when you have the ability to train, top, and scrog them. Not to mention you have a light on a timer I assume? So whats the point? Outdoor growers in climates that get wet and cold in the fall are in my opinion what they are best suited for, but for indoor growing.....pointless.

Well it is ph. For starters you are growing in coco the wrong way. Coco is Hydro in a potter. So there is no dry time in coco. Coco has no nutritional value so you need to add nutrition always and have lots of run off. Do not let it sit in run off. Test run off ph. It should be 5.8 going in and 5.8 comming out. You can not over water in coco. I have grown using coco for years. It will also require a cal mag in the feed.

Discoloration in leaves with little to no growth could be indicative of various issues. Here are a few possibilities: Nutrient Deficiency: Yellowing or discoloration could be a sign of nutrient deficiencies, such as nitrogen, iron, or magnesium. Consider adjusting your nutrient mix accordingly. Overwatering: If the substrate is consistently wet, it may lead to root issues, limiting nutrient absorption and causing yellowing. Ensure proper watering practices. Underwatering: Insufficient water can also cause leaf discoloration. Check the soil moisture and adjust your watering routine if needed. pH Imbalance: Incorrect pH levels can affect nutrient uptake. Ensure the pH of your nutrient solution and soil is within the optimal range for your plants. Root Issues: Root rot or other issues with the root system can result in yellowing leaves and stunted growth. Check the roots for any signs of decay or pests. Light Stress: Inadequate or excessive light can cause stress. Ensure your plants are receiving the right amount and type of light for their growth stage. Temperature Fluctuations: Drastic temperature changes can stress plants. Ensure your grow environment maintains a consistent temperature.