I like smaller isolated/inclusive reservoir, kind of like a bubbler bucket. Change it out once a week, top off throughout the week.
Small reservoirs are harder to control the swings and fluctuations but are much easier to manage with a frequent reset.
I find increasing the frequency of resetting the reservoir decreases opportunities for pyth algea and temperatures to climb too high without needing a chiller or running some kind of sterile res. Some folks get by with no chiller and running biological and recirculating systems, but it's a lot of maintenance vs dumping a bucket and filling it back up.
That last line leads into how I reset, have another of the same type of bucket ready with fresh nutes, swip swap the lids (can get tricky with very large plants)
