They have been pretty slow growing from the start, but I've been patient and now it will be 1 month on Tuesday and they are still tiny as hell. The biggest is around 2". Strain: AK-48 (the two "bigger" ones) Bag seed (the two "smaller" ones) Temps: 73(night)-77(day) deg F Intake: 3" computer fan Exhaust: opened one side of the lid ~1.5" Ventilation: 6" fan inside of box for circulation Soil: Jiffy Organic Seed Starting (FoxFarms OF waiting for transplant Light: 19/5, two 42w CFL (2700 lumens each), 2" from plants Water: 7.0 ph water with Superthrive every watering, nutrients (MG Orchid Food 30-10-10) every other watering Humidity: don't have a guage, probably pretty low I don't have an actual exhaust fan yet because I didn't want to cut a hole for it in the tub because eventually I'll stack another tub on top to add height and I didn't want to have to patch up the hole. Could there be too much CO2 at the top of the tub not being exhausted? The fan inside for circulation isn't the strongest, but a lot more than the 3" computer fans. I'm under a time crunch here as I'm most likely moving mid-late May. What do you think the problem is with the small size?