Wow, that was stupid of me.
 

So I fed the tank last night around 8:00 as I do every night, and per usual I turn off my power heads so the fish can enjoy their meal.

Well without thinking I turned off the lights in the basement and headed up to upstairs. I go down at 6:00 this morning to peak in the tank and realize that I forgot to turn the powerheads back on.

The tank spent ~10 hours with only the return from the sump providing oxygen (I have it thriottled back to ~200G/hour) Eveything seems to be fine, and the fish that I can see in their sleeping spots look OK. The actinics come on at 10:00 so I'll get a better look then.

Been there, done that. :redface: Hope everything's ok.

lucky the return was on

:) Lights are on and everyone is alive and accounted for. Just enough water exchange for everyone to stay happy.

It's amazing how tough some of these fish are. I did the same thing over a 14 hour period. Tank temp went down to 65 and apart from all my fish being sluggish till it warmed up everything was fine. Less movement = less oxygen consumption. Go figure