<a href=showthread.php?s=&postid=15424769#post15424769 target=_blank>Originally posted</a> by username in use
The problem is that at night, you Oxygen levels go down in your tank anyway, so if you turn off your skimmer your further reducing your O2 and essentially suffocating all your fish. If your going to turn it off at all, which you really shouldnt, do it when the lights are on. But seriously, run it all the time.