I'm proud to contribute my 3 acres to this. I definitely don't water any of it though - I want it to grow as little as possible! More growing = more mowing.
fertilizing is also easy, fish and turtle excesses: just feed my turtles (separate aquarium) with excess floating leaves ... and get the fert the next day (the same spirit with those who use rabbit for fert)
Alongside, i romantized with chemistry lab 101 ... after reading forums on ferts (google PMDD and Estimative Index)
Made my own fert, mixing KNO3, KH2PO4 (NPK part), Mg,Zn,Fe and minor traces
Chemistry is another side of life that u can get a lot with little effort ... so is aquascape (compared to gardening)
These stuffs are almost like hacking/programming (tho not as scalable) so naturally i'm interested ;)