I just started gravel vacuuming without turning off the waterfall filter. I'm not sure at what point I turned it off as I was too busy trying to stop water draining and unplug at the same time when I realized but the whole thing was pretty empty.
Filled the tank up again and turned the filter on after priming it and NOTHING!! Dead!! Oh bummer, not more money to spend on fish I'm thinking while contemplating throwing it across the room.
But I controlled myself and thought maybe I could just buy the pump part so starting giving it a clean which is when I wondered about all my good bacteria on the sponge and oldish charcoal and how I was going to keep them alive. Sat the bag of charcoal in the tank to give me some time to think more (maybe) and put the sponge in the filter on another tank.
Finished cleaning the filter (of algae mostly) and plugged it back in for another try and hey presto - it worked!! Yay!
How would you keep all that bacteria going?
miskairal