Hi folks this is my first time here, I have kept freshwater fish in the past but after a long time without keeping any fish I am looking to set up FOWLR tank. My idea is to just keep a pair of Darwin Clownfish the black and white striped ones. this is what I have been told they are called. What what would be the ideal tank size to keep these two guys and is RO water an absolute must ? This last point is actually whats keeping me to go for it as availability of RO water would be an issue here were I live and I dont think I would be able to buy an RO unit even less installing one in my flat. Another question I would like to ask is what would be cheaper to buy a complete ready tank like the Fluval Flex Marine 123l and maybe the Red Sea Nano 75l (quite expensive) or buying a bare tank and subsequently adding the filter etc ? One more thing is a protein skimmer also needed cos I have read conflicting comments on this one.