I had an African Knifefish, but he has disappeared from the tank. He must have jumped out during the night. There is only one opening, where the filter is. The tank is in my room, so we have isolated the search to said room, but he is absolutely nowhere to be found. He's too big to have been eaten. I fear that I will get a nice dirty lake smell in my room if I don't find him soon. Any help on this matter would be appreciated; I have literally searched everywhere, even in the lamp.