I been using rain water in my fish only tank, a friend of mine that have a 600G tank said that is ok. Some people say that is not good to use, that I should use tab water with a ROD filter.
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This.Rainwater is not good to use because of all the crap that is going to be in it, your best bet is to just buy a RODI unit.
That is what someone told me but they can't tell me what is all the crap in rain water. Does anyone know?
Honestly there is too much to list and it would change depending on where you live but for basics most rainwater is acidic, will be full of agricultural run off and pollutants. These things will lead to algae issues and livestock die offs.That is what someone told me but they can't tell me what is all the crap in rain water. Does anyone know?

