I had a Customer, and I was the only one that could touch his Water Source Heat Pumps, in his Condo. This was after, many calls by others, I diagnosed a bad Balance Valve, and fixed the Problem. In his living room was what I estimated to be a 60 to 75 gallon Aquarium, it was oddly sized. In it was a Blue Ring Octopus. The top opened on the ends, not the front. He had a Mason Jar with the bottom cut off and glue to the top glass at the front, it had the wire closure, with a small pad lock on it. Exposed drain pipes to the sump, returns in the back. He said all this was glued together. I had keys to his Condo, when I made a service call, I dang sure checked to see if it was in the Tank. One time I heard a tapping, found it had picked up a large piece of rubble and was tapping on the lid of the Mason Jar. An immediate call went out to the owner.