i was cleaning up in the tank and my biggest del got spooked and took off, swimming right into the hole in the bottom of a flower pot. he ended up stuck. his head and pectoral fins went through but is so large he couldn't go any further. so he was lodged in there pretty good. i ended up having to break the bottom out, then broke the bottom in half freeing him. im just glad i was home. i took out the other pot to prevent this from happening again...