I transplanted my seedlings yesterday and adjusted my seedling growing rack to accommodate the larger plants. Everything looks good so far. I am using a modified bottom watering system and a wicking medium to draw the water up to the plants. I made it out of commonly available plastic storage containers that I bought at a local discount store and used fabric shopping bags to contain the growing medium.
I am growing several varieties of red lettuce along with curly kale and red Swiss chard.
I used a plant food product called Safer® Brand Oxygen Plus that also contained liquid fertilizer and Hydrogen Peroxide - oxygen booster. This is no longer available but you can use generic Hydrogen Peroxide from you pharmacy. The translucent watering tray will allow me to visually maintain the necessary water level.
I also planted some in square half gallon pots placed in a regular seedling flat as a watering tray. We shall see which plants do best. I may experiment with a gravity feed watering system at some point - but for now I will simply keep the watering trays filled every few days.