Buy a better proven and better quality ones. May be from my own opinion, the cheapest is reef octopus skimmer needle wheel.
http://www.aquamarin.com.sg/productsDetail...id='99'
Kalau kocek deeper, boleh pakai H&S atau deltec..... power seh ...
(Nak beckette skimmer tak)
if your tank is about 600liters, try to get 20% more capacity to anticipate bigger bioload as the ikang2 membesar...