Well it's only happened twice, but both my purple fire fish have disappeared. They were doing fine, seemingly unbothered by other denizens, then they just vanished. I have a biocube with a lid, but the little access hatch is open for the automatic feeder. Could they have managed to aim for that opening (then a dog removes evidence)? They're not hiding in the back with the filters. The most aggressive thing in the tank is a pushy clownfish, but the timid clown goby doesn't seem to be bothered by him.
