Hello Tony,
If you look at the pic below it is an old one of my refugium. Where it is blackened out on the left side, there is a tray 1/2 way up that I used to place base rock or frag plugs for curing. When I got the mangroves they were 8" pods with 2 - 3" roots on them, now they are 10 - 12" with 6 - 10 leaves on each, and the root system is 6 - 8" long. I have 2 phillips marathon spiral CF bulbs and 2 2' phillips plant and aquarium bulbs over my fuge.
HTH, will get some newer pics so you can see the growth.
(gee looking at that pic, does my wiring look messy...
)