I planted 3 seeds per cell in a 72-cell tray and had almost 100% germination. I want to separate seedlings and pot each of them up to sell extras, which I've done successfully in the past, but for some reason it seems my seedlings are really slow. It has been 5 weeks since sowing and at an inch tall, their true leaves are just now beginning to form. Does this seem slower than normal? They are under lights 16 hours/day. Should I pot up now in hopes that a little more space will help them along, or let them grow out a bit more first? My plant-out date is late April.