Immediate Help Please! Mold?

Too much humidy? It is dead and the spores are spreading. You need to get rid of it as well as the soil/coco and totally disnfect everything. You could have contracted the disease during germination and transferred it to the soil where the conditions were just right to spread. If germinating in a humidy dome, try and avoid excessive heat. If germinating under your lights, try and avoid TOO moisture (wet). Good luck on your next run.

Growing medium looks pretty damp. Was it saturated before planting seed? With a new seedling you want the soil pretty much dry, except right around where it's broken the soil. For future grows, start with a damp but almost dry medium and use a spray mister to mildly dampen the soil untill it starts to sprout/take in more water and keep letting the soil dry out between feedings.

Yo dejaría de regar/pulverizar al menos 3-4 días, espero que se recupere. Cada 15 días dale jabón potásico a las hojas y alrededores