Budb -fish are too control mosquitoes in rainwater collection tanks, yea rainwater(they only get distilled water when I initially fill the clone machine) then it's rain water the rest of the way(no acid rain here yet). Used to be the guy that took care of the tap water for rural water district, to many state meetings about what you need to put in for me to use. Even hate to shower in it but do. All the rest is double filtered.
After reading and following thread I pointed out for you, really wanted to fill the swimming pool with plants but the higher authority around here said no, so I K.I.S.S. my way through most things. Lots of things I want to try though.