I observed two things about my not really healthy fish.
1. She loves to spend hours above an airstone, so she surrounded by bubbles. I read that microbubbles might be dangerous for discus. Is it correct?
2. As you can see in the photo (I hope as quality is not great) there is a long stringy white poop. Some sources say that 'black plague' might be a combination of few bacterial infections. Might it be a case that after lowering pH + Epson salt some external bacterias have been combated, but there is still some internal parasites?
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... I try to make a better picture during the day.