I'm quite certain that if I were to keep adjusting my search I'd find the answer, but, I couldn't with the initial search. So, the question is simple -- I can set up a freshwater aquarium, plant aquatic flora in it and have a stable biosphere in 2 weeks. A 65 gal. would easily host 2-5 medium angelfish, a cleaner fish and a couple dozen of either guppies or mollies. (1 male to every 10 females, roughly.) With the water, you get plant die-off, fish excrement, urea, baby fish (that's what the guppies or mollies are for.) All those nutes, in a stabilized and fairly consistent medium, fully under your control and supervision. Anecdotal Comparison: In the past, I ran a couple hundred gallon setup, and the water worked miracles for herbs, flowering, and fruiting plants (roses, tomatoes, etc.) A properly maintained tank will have all of the benefits of a freshwater (river/lake) supply, but none of the external contaminants (bacteria from other plants/pollution/pesticide runoff, etc.) The 65 gallon would produce 6.5 gallons of enriched water weekly (or 13 gallons every 2 weeks, a regular "water change cycle". (20% water change)) The Question: Does anyone have experience with using freshwater TANK water for nutes or nute supplements? If so, please share your experiences, as I'm really debating setting up a tank or 2 but, only if it'll be beneficial! I've already replaced my growing fish hobby.