After that if I need a bigger container I just set the fabric bag inside a larger one and the roots grow right through. Little to no shock with either method.
Im old and need every lazy shortcut I can find.
Here is my watering funnel.
I can stand up and water any plant in the tent.
Transmission funnel from Walmart plus a 3/4 pvc pipe of whatever length you need.
Sorry you didn’t get a answer. Your 550’s with low dimmer knob setting can pretty much be as close as 18" from the top of the tallest plant. BUT 24" is ideal with a bit more dimmer. Quantum Boards are not for close in growing. People get upset with Quantum Boards because they buy short tents, run them to close to the canopy with to high dimmer settings and then smoke there plants.