I was chatting online with a friend from home, looked over at "Hestia's" tank and saw him looking at the filter, which he usually does. I looked away one second, and the next I saw his tail waving from inside the filter. I usually keep the water level slightly above the lip of the filter to reduce any current.
I unplugged the filter and turned it on its side in the water and pulled out the cartridge slightly. "Hestia" swam out, a bit dirty and stressed but no worse for the wear.
I have a Whisper 10i filter for 1-3 gal tanks. I'm afraid of turning the filter back on in case he can fit down the tubing and get stuck. Am I just overly paranoid?