Just my two cents - if at all possible I would avoid any skimmer made by Red Sea. I have had nothing but trouble with the Berlin Turbo I bought, I'm on the third pump - and still doesn't make foam. I have a Prizm- it's noisy, but it works well considering the cost. Not a great skimmer though.
I finally just got so mad I found a used AquaMedic which works awesome, and it's about the same price new as the Berlin XL.
I'm not the only one who's had trouble with them - and I'm not impressed with Red Sea at all lately. I got into it real good with a rep in regard to why their test kits aren't uniform, and he gave me some total BS answers, which just really ticked me off.
Excuse the venting - but I've not had good luck with them at all.