So for all you diyers out there I'm sure you've seen the idea of using those cement mixing tubs as a table and a tote as resevoir. well the issue is these aren't that big even the largest one can fit maybe 4 or 5 6 inch nets pots. and wouldn't really be able to grow large plants for lack of support. anyways, I wanna do 2 of these 21 gallon cement mixing tubs side by side in a 4x4 area but my issue is running 1 or 2 27 gallon res? is there anyway to run a set of fitting per each tray and only one resevoir? because I believe to flood the 2 trays 27 gallons would be more than enough? and 27 gallons per tray would be overkill?