I should be done with my first grow and a month or so I've been thinking of upgrades.

One thing I've been told is that I should have a reservoir that can hold the same amount of water that my system runs on without it. Considering that at most I will run 6 plants in 5-gallon pots that will hold four gallons of water each, I will need a total of 30 gallons to be safe.

My assumption is that a nice cooler would be the best starting point for a reservoir because it would offer better built-in temperature control than any other container I can think of.

Has anyone tried this or have any thoughts on why this might be considered a good or bad idea?

Thanks for taking the time!

P.S. If anyone has an idea that they consider a better plan of attack then my current suggestion please share, I would appreciate it!