i dont know much about hydro,
but i would say if your tray holds up to 10 gallons before it drains, get a 15/20 gallon bucket/bin and do some test runs, theres no rule that says you have to have a small resevoir...if its too big just dont fill it up as much
babystarbud Reviewed by babystarbud on . reservoirs Hello Guys & Girls Is there a rule for the size of the reservoir to the size of the tray?I have a 22"x22"x7"flood & drain tray.How many gal reservoir will this tray take? What Iam saying is The tray will hold say 10 gals,how many gal. reservoirs would you use? Any help with this is greatly appreciate. Merry Chrismas to all. peace Rating: 5