Leave curling up need assistance.

hi For the first time, you have chosen a very efficient substrate (Coco/Perlite), but it is less forgiving of errors than soil because it is completely inert. ​What you describe and what we see in the image — the edges of the leaves curling upwards (the famous “taco” effect) — is a classic red flag. ​Here are the main ways to correct the situation: ​1. Heat or light stress (Cause #1) ​Symptom: When the edges fold upward, it is often because the plant is trying to reduce its surface area to conserve moisture. ​Solution: Check the distance from your lamp. If it is too close or too powerful for a young seedling, it causes excessive evapotranspiration. Raise your lamp 10-15 cm and see if the plant relaxes within 24 hours. ​2. Relative humidity (VPD) too low ​Analysis: Coconut dries quickly on the surface. If the air in your tent is too dry (below 60-70% for a seedling), the leaves will curl up. ​Solution: Use a humidity dome (like the bottom of a clear plastic bottle) to keep the air around it moist while it develops more roots. ​3. Nutrition and pH in Coco ​This is where the “trial and error” often begins: ​The pH is vital: In coco, you must water with a pH between 5.8 and 6.0. If your pH is that of tap water (often 7.0), the plant is immediately blocked. ​Do not let dry: Unlike soil, coconut should never become completely dry. If it dries, the nutrient salts concentrate and “burn” the roots, which stresses the leaves. ​4. Leaf condition We also notice slight yellowish/light spots on the first layer of leaves. This confirms either the beginnings of light burn or a pH imbalance that prevents the absorption of basic nutrients. ​My advice for your first coco grow: First check the heat at the top of the plant (if it's hot for your hand, it's too hot for it). Next, make sure to always give a light nutrient solution with adjusted pH each time you water. have nice day