Well it seems I might have spoken too soon about my "happy" Jawfish. A few hours after posting last, I heard a loud "plop" come from the tank. I went over to find Kululu sitting on the sand looking agitated after presumably jumping out and bumping his head on the plastic edging at the top of the tank. Well at least my jawfish defenses seem good enough to prevent carpet surfing!

The next day he was nowhere to be found in the tank. Growing increasingly panicked,...