well he finally found a way in... i was taking filter apart to do the cleaning of the tube... i turn my back for two seconds and my filter stopped working. I took it out tore it apart, checked everything, no success it pumps but no water getting to it. But the tube was letting water through. So i tore the tube apart inside by the pump... found what the problem was. My red tail shark had swam into the tube and when i turned it back on he got sucked into the tube and stuck. I was able to get him out and save my filter but unfortunately he did not make it. This is my first fish escape attempt and guess it didn't go well for him...lol
He is in the big fish tank in the sky now