My seedlings are about 1-3 inches high. some our bagseed and some are bought seeds.
ph 5.8-6.2 steady
temp 71-82, water temp 61-71
a/c controled room, fans moving on plants 24/7
homemade c02.
hi output t5 floro 2x4 unit with 8 bulbs. 40,000 lumens
lights 20/4
ionic air filter, charcoal...