If I had to guess, as I can't see the rest of your overflow, your water level is too high.
In my biocube that only happens if the floss is plugged up(needs to be changed), or if the water level is that high in my back chambers.
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80G SCA Build: http://reefcentral.com/forums/showthread.php?t=2560256
Originally posted by der_wille_zur_macht:
"He's just taking his lunch to work"
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