Shake- you grow in hydroponics yet before you give that advice?

2x4 tray on a 25 gal reservoir will comfortably flower 30 plants in 6" pots of hydroton. I currently flower, in my 2x4 tray, a combination of plants in 6" pots for commercial strains and 3" pots for boutiquey strains that don't grow large as single cola plants with no veg time from clone. At the moment I think I'm running about 40 plants per tray mixed in pot size like that, or 30 if I am running either the Afghani Dream or MSS that get real big, real fast.

It would hold 32 x 6" except that the fill/drain fitting prevents the last 2 pots fitting in there.

Running large plants in a flood and drain is not a viable option. A tray of that size with 3-4 plants, used with canopy efficiency in mind, would require either a bed layout or like 3 gallon pots, and honestly, you end up with a LOT more risk of root rot, like, exponentially a lot more, once you get a big root ball in that type of system.

Edit: I don't have time to post pics before I have to go to my second job but go look in the grow logs, the user 'foxysox' has a thread in there running that style...