definitely not light burn, no worries, there.
dial back onnutes... You've been feeding from day one in diary. Soil has nutes, seed has energy for at least 10 days or so... Irrigate with water only for a while.. (the microbes ar fine, if they are supposed to be used.. typically if you put them in wiht seed, you don't need it after that from what i understand. It's a culture that'll grow on its own with your plant.