...if you just potted up seelings into 7 gallon pots i'd strongly recommend you water very sparingly until you see some signs that the plant is healthy and well established, personally, i'd have potted up in at least 2 more stages before getting to the 7 gallon size because with that much media and so few roots from such young plants creates a situation likely to cause signs of over watering, 7 gallons of media fully watered in and with no roots to speak of will take a LONG time to dry out.
peace, bozo