Filter Making 'gushing' Noise

Is the filter an internal, and if so did you leave it running during the water change?

Since fishcake's tank is 30 litres, I'm assuming the filter is an internal, which won't need priming. But it could still be air.
The bit that worried me was

Whilst doing my water change this afternoon I noticed my filter was making a gushing noise

which made me wonder if the filter was left on. That would certainly suck air in, and possibly damage the filter if it runs with no water inside the impeller well.

Is it still making the noise? Have you tried tilting the filter gently to free any air tarpped in the impeller well.? Mine sometimes spurt bits of air out after a water change and I find tilting the filter helps to free the trapped air. The air gets in when the water level drops lower than the impeller well, then when the tank is filled up again, the air gets trapped in there.

Hopefully, just a short time won't have done much harm. But make a note to yourself to turn it, and the heater, off in future.


My problem is remembering to turn it back on again, but it's usually the heater that gets forgotten.........

The motor can also get damaged when running dry.

Keep tilting the filter till all the air has gone. There are times when I switch it off, unstick the whole thing from the glass, turn it upside down under water then switch back on for a few seconds. Then switch back off and carefully manoeuvre it back into position while keeping it submerged, and switch back on. It's a fiddle but with some filters it's the only way to get rid of all the air. Or do all that with just the motor if you can get it on and off under water.