I have an 75 Gal tank with an overflow system with 2 U tubes. Yesterday I shut the tank off to do a small water change, and when I turned it back on and added more water the overflow quit draining. The back side of the overflow just filled up and almost overflowed. Any suggestions? Now my tank has been off for over 24 hours. What should I do?
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- Thread starter Lfrench
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Are you talking about a over the tank wall overflow....it needs a suction to get going watch this video
www.melevsreef.com
How to Prime a HOB overflow | Melev's Reef
A HOB (Hang On Back) overflow or weir is a device used to drain water from the aquarium safely into a sump. You need to prepare yourself, as this is about 30 seconds of your life that will get your heart beating faster than you'd expect.
24 hours is a long time to be off with no flow
did something get stuck in one of the tubes /pipes..... yes pictures would help
Pistondog
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Did the siphons fill with air bubbles? This is common and will break siphon after restarting.
It is caused by low flow that don't clear/suck down the bubbles while siphoning. Can you run with 1 tube? This will increase the flow thru that tube and might keep, it clear of air.
