I have spent the afternoon in a not so local Aquatics shop getting some great advice on buying and setting up a marine system including fish, live rock and coral. i was looking at an Aqua One Regency tank and cabinet, 180litre, with an Aquasys external filter included with T5 lighting. They then suggested for a very good setup to add a second filter, an Eheim external wet/dry filter, a UV steriliser and a 4500ltr/hr powerhead, plus all the sand and live rock. They said there wouldn't be a need for a protein skimmer. Would this be a good setup? i am a little confused. I have seen things like the red sea aquariums and they have filters and skimmers. What would be best?? Cheers