I would really like to thank you all for your replies! Now I'm nearly determined to purchase a recommended piece of equipment...I think that when it comes to my tank's gallonage(~65gal -> ~250 lt) and taking into account my preference to a hang-on solution, the Deltec MCE600 skimmer tends to be the ultimate choice! What's your opinion? I have to mention that in my country (Greece) Deltec is not as much popular as in the rest of Europe and the USA. So the LFSs seem to ignore this brandname and I'm gonna make it through the Internet! The company's link is http://www.sewatec.de and it offers this skimmer at the price of EURO249.00 and furthermore I decided to purchase the RO unit that Sewatec has built, the SEWATEC OSMOTEC 230lt/day - with pressure gauge and flushing valve in a price of EURO159.00! I need encouragement, especially from (mainly European)reef-afficionados who have experience with this company or with the products I described...Many thanks in advance again!