you could add some fish to your water reclamation tank for a small aquaponics system. Grow a few plants to feed the fish and this forms a closed system. There is no need to fertilize, the fish do it for you! Permaculture at its finest!
Linked grow beds with overflow water level at top of each bed + an interconnected drain line at the bottom of each bed. As long as the beds are dead level, this will work very nicely.
Cycling a tank for aquaponics can be done with fish, or without fish. Find out the difference between the two methods and learn about cycling in general here.