i just hung a used refugium, on my 30L tank i know nothing about these it has a pump to pump water back to the tank, how do i start the syphon (big large u shape tube) tyied using a air hose thru it to start syphon that i saw somewhere but it didn't work.. any suggestions? or do i need another pump the refugium is a ecosystem 40 without skimmer.. downloaded the manual but its vauge about this part.