How tall should my 3 week old plant be?

Seed type: The Church (Will add a picture tomorrow to help...)
Outdoor grow averaging 9 hours of sunlight a day
Watered every other day
Fertilized with dry rabbit pellets (Droppings)
Roughly 6 inches high atm & currently 4 nodes deep but with minor curling...

Can anyone offer any idea's/tips on how to make any improvements or is this a normal hight for this stage?

Thanks