How long does it take tap water to become safe to put in a fish tank?

Poison Ivy

New member
I've left it in a jug for about 12 hours now, is this enough? I've run out of water ager and can't get any more today.
We always left it out for about 12 hours when he had goldfish and not tropical fish and it never hurt them. : )
Would rain water be safe if I put a jug outside to catch it?
 
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