RO filter

[GODZALLA]

hello MFKS ..

i wanna know something about the RO filter for fish

first of all i need it to breed oscar cichlid so alot of people told me the RO will make it more easy .. so

i wanna know first does it has to be RO-UV or only RO ??

and can it be harmful on any other fish .. ( in case of breeding too )

or can it help in breeding some other hard-breeding fishes ???

or it will make it more easy for all fishes to breed in RO-Water ???