I have six 5 to 5.5-inch discus that are about 11 months old. They often exhibit a shivering behavior, which lasts for a very short time but is still noticeable. I tried a potassium permanganate (PP) bath, thinking it was due to external parasites, and I also tried metronidazole, assuming it might be hexamita. However, neither treatment worked. Their appetite is really good, so I'm quite confused about what’s going on. Am I missing something? The water parameters are:
Ammonia: 0
Nitrite: 0
Ammonia: 0
Nitrite: 0
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