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i have a 90 gallon tank with currently six fantails, and over the last few weeks we hve lost two fish from what we think may be swim bladder disease, but we are now not so sure, they have been treated for swim bladder and then with other medication when that did not seem to be working, but they died anyway. now another of the fantails is sick displaying the same symptoms...he is sat at the bottom like he is sulking, but with quite droopy fins, he seems quite bloated, and he also seems to have a black mark behind his eye and some patches on his gill...and this is exactly how the others started then rapidly their boyancey goes and then they die and nothing seems to help even with early intervention...does anybody have any idea what this could be..we are really desperate..