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.
Home aquaponics systems are the most efficient way to grow plants and protein at the same time. Learn how to get started with a small scale system.
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.