i dont know if it is safe to use rainwater in singapore at all. It may not be that soft anymore after falling thru all the stuff in our sky, let alone clean.
I do not know how relevant is it for dwarfs.esp those wild ones or direct offsprings of them, But many ppl myself included had bred fish using water parameters which can be quite far from what is "natural" for them.
For many it is not abt replicating the natural conditions as suggested by all the literature, it is abt accliminating the fish smoothly to what you can provide for them while avoiding opposite extreme
And yeah, RO is luxurious
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