That tray is appropriate for 100 rooted clones (flowered at ~4-6" tall) under a hps1000 in 6" pots of hydroton.

You will need to keep a separate mother room to stock your tray.
I would not advise as a general rule doing plants from seed all the way to harvest in ebb and flow. They will get too large and you will very likely end up with root troubles such as rot.