Air in our closed loop system
Help! We aren't new to the hobby, but have had a fairly low maintenance tank until now.
We have a 120g reef tank. last week we had a lot of air in our closed loop system which then killed our chiller. We replaced the chiller and cleaned the pump. Problem appeared to be fixed. No air since Thursday until today (Tuesday). Now suddenly we have A LOT of air in our closed loop again. We turned off the chiller so we don't kill another expensive piece of equipment.
Any thoughts about why or where we could be sucking air into our system. It runs from the tank to a GenX PCX 40 pump then through the chilller and back into the tank.
Thanks a bunch for your help!!!
Ware and Kristy