Posted 11 August 2017 - 04:26 PM
My trash can rain barrel is not used for water to harvest, it is mostly in place to prevent run-off from the roof from carving a big honkin' crater in the back yard. We live in a mill village in a good old brick house built in 1925. Like many of the mill houses, our roof is the original slate tile. (Plus whatever else they may have treated/processed the slate with back then, and has dropped out of the sky on it, or collected and grown on it in the last 92 years; I don't want to know.) I do not use the water for fish tanks, but it supports gambusia and Redbreast Sunfish long-term. My 100g stock tank pond also receives roof run off, though not as much, and it supports vaarious darters, Greenfin, Yellowfin, and Dusky Shiners; Flat Bullheads and Blackbanded Sunfish very well. Eastern Mudminnows,however, can't seem to make it but a couple days in there. Soooo, if the water of dubious quality rolling off my roof will support those fishes, I bet you have a pretty good chance of being able to use rain water, too. I would think a simple bubble aerator or cheapie Sun-Sun current generator would turn over water enough to prevent stagnation.
"No thanks, a third of a gopher would merely arouse my appetite..."