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I think if someone is aware enough of the environmental benefits of catching rain water, they should also be aware (and unoffended by) the wonderful (and not so wonderful) smells of nature - that is, if this smell is a biotic smell and not the smell of the tank material. If anything, the plants you water will like the added nutrients of the algae or whatever is in there better than just plain jane rainwater. IF it is actually stinking up the whole house and surrounding area (which I can't imagine is the case), then I would find some use for ALL of the current water, and use some baking soda and vinegar to clean out the sides and bottom of the tank. That will shut down ANY smell. You could also choose to use citrasolv, or a strictly citrus oil based solvent to clean up the inside of the tank, but I really think the baking soda and vinegar will do the trick, be cheaper, and won't harm anything you use the water for after rinsing the tank out.
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