get two tubs and keep one on standby. when you need to clean your res, just mix up a new batch of solution in the extra tub, and swap the plants over. I have 4 plants in 11 gallons.
keep light out of the res.
check your ph weekly/biweekly. I check weekly.
they can drink a lot depending on a lot of variables. larger plants, flowering plants, etc. check levels when you check ph. I refill with distilled when I have it. spring/well water when I don't. if I'm lasy I'll use tap water left out for a day. I'm not very consistent.
I'll spend about 5 minutes a day tending my garden. an hour on cleaning day.
try not to be too high when tending your garden. you tend to make mistakes when high. not always, but you get the idea.
this is the easiest hydro setup I've seen yet. it's damn near idiot-proof. these plants will take a lot of abuse too. I'm not careful at all.