If you are buying all of this hydro equipment... maybe try hydro for your next grow, you just need a medium and top tray. Theoretically I can be away from my plants for 2 weeks, but I could pull off 4 weeks. I have a 50 gal res with a pump that extends to my bathtub...easy to flush. Then I have a 50 gal drum res with 3 part mixed in at full tilt. My res has a float valve on it so I just turn it on and i constantly have my res topped off with fresh RO water. Then my pumps are on timers. I can feed up to 9 times a day as often or infrequent as I'd like. The whole thing is pretty nicely automated, but still check it twice a day every day, and I plug my pumps in by hand. Timers are what you rely on to keep the environment stable, if your timer doesn't fire, or turn off... your plants will suffer.