another pic.

Not sure what variety, probably leaf lettuce at 6 days after transplanting. or 18 days after sowing

and these are 14 days from transplant or 26 days from sowing. are they growing normally? slow? fast?

Thanks "carb" for sharing the image of bibb lettuce you are growing. It's an informative thread. Can you tell which type of system you had used to grow lettuce?

They look just fine.

Are you on full-strength nutes?

Here is a link that might be useful: My Indoor Growing Adventure

Im not sure if you could call the system deep flow as i just use those 6 liter water containers, cut the top of and measure 4 liters of nutrient. Theres a bubbler inside btw. The ph is around 5.5-6.5. EC is 1.9-2.0 on the left and 1.8 on the right. The baby bibb ph is around 6-6.5, EC 1.1. The setup is running under 3 14w flourescent lights 2 feet each attached to a wooden frame taped with aluminum duct and supported by books on both sides. Room temp i would say around 24-26c, water temp around 24-27c

Perfect small greens grow!!!

Here is a link that might be useful: My Indoor Growing Adventure

It looks like a deep water culture system. Or a raft, but that is basically the same thing.