ChatterBank5 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.The bloating (dropsy) can be caused by a viral or bacterial infection, this could also explain the discoloration.
It may be worth trying an antibiotic treatment as this will sort out the problem if it is bacterial.
Is the water quality good (pH, acidity, nitrates etc), this needs correcting if it isn't right.