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I only had a reservoir and a top off tank, so 1 less to change than you. I definitely changed the reservoir that the plant was in weekly, and tried to do the same with the reservoir, but did miss a few weeks due to life being busy. One time I got lazy early in the grow, and didn’t change the top off tank for a few weeks. It wasnt the end of the world, but I felt it contributed to a slow start that run. I can’t recommend anything else, but I know some have had success without changing as frequently.