hey lazyman, based on your comments..do you turn off your pumps during night time?
Correct, no watering at night. The circulation pump in each tank remains on, as does the air pump. Frequency and duration of waterings are up to you and your medium (as well as plant and pot sizes) and have been discussed at length elsewhere if needed.
I'm doing a new setup that will incorporate the tall boy filter as a prefilter for the Merlin Pro RO filter too, split out to 5 reservoirs. 750 gallons per day, woot!