I noticed a bad smell tank side today. Usually this means a snail went overboard between the tank and the wall. I vacuumed behind the tank but the smell persisted. What I found was my Circulation bowl for the Plank feeder became clogged and stagnant. Man did that thing stink. Because I use the Cannonball I didn’t notice that the pump had clogged and stopped working. It was full of decaying mysis and pellets Keep an eye on that circulation pump especially if it’s covered with the Cannonball