I hate to even have to submit to this depressing thread but I present my late boy Rodriguez..
Theory; In the middle of the night when the lights were out he went up for air and from out of nowhere comes Marge (the arowana) and chomps him right over the back but lets him go as soon as he struggles back (she wont eat live food)..
He stoped eating for 2 days but where still active, had scars that looked a lot like marges' jaws and ripped fins.. I thought he would make it but I found him in his cave yesterday.. I went fishing, and took him with me in a bag and let him go in the sea to give him an honorable funeral.
Swim on Rodriguez!