Hi guy's was at my lfs yesterday and was speaking to a guy regarding fw to sw and he was very negative, saying it wasn't worth the effort etc etc, anyway my tank is 20 gal and I was asking what I would need he said protein skimmer live rock live sand and this will cost me around 500 pound, after looking on here is a skimmer really vital? Many set ups don't use them! Will my tank be large enough to support one clown fish? Or will I need a bigger tank? Cheers
