09-23-2012, 12:39 PM
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I've never collected rainwater for a tank, but I have tested the rain in my area. From time to time I've found traces of ammonia in it. . . really very sad and disturbing, but something to keep an eye out for. I have a plant bucket out on my back porch over the summertime, and I have found my fair share of mosquito larvae and damselfly nymphs, a fine mesh screen solved that problem right up. Over the course of a WEEK, I didn't have any problems with algal growth, and the plants did very well outside in the sunshine, but after a month or so things started to get slimy in there, so you'll probably want to periodically scrub out and sun-dry the tub.
You know I'm REALLY excited to see how all this works out! Hope you find the information you need to keep your fish safe, and that everything works out how you hope! Good luck, and (of course) please keep us posted!