Thanks Jason - yes it is a very small leak - only a drop or two after a few minutes. The way I tested this was to close the gate valve, fill the overflow with water and watch for leaks into the tank. My concern was to ensure that in the case of a power outage, that no water leaks from the tank into the overflow and then down into the sump causing a flood. I have already done another round of silicine in the affected area - if for some reason this is still leaking, you think it will be fine?
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90g mixed reef (eventually!); 23g sump; 20g QT; Waveline DC-5000 return; 2 Radions; 2 Vortech MP10s; Koralia 3; ELOS ATO with 14g ATO tank; RLSS R8 skimmer; BRS reactor - GFO/Carbon; filter socks; Puratek RO/DI
http://www.canreef.com/vbulletin/showthread.php?t=85303
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