03-30-2012, 10:53 AM
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To my knowledge there are only two reasons that a fish's tail would disappear. Either disease (like fin rot) or being nipped off. In either case, you will not find the tail, it is simply "consumed" by something.
If you have been treating for fungus, that could be it (the fungus). But that does not rule out nipping, from some of the fish you have: some loaches nip, the cherry barb themselves might, and the Golden Barb is a nipper--though I would expect the Gourami to be its target.
Have a read of our profiles, these fish are included.
By the way, barbs are not characins, they are cyprinids, so I have moved this thread to that section.