What and how often are you feeding? How is water quality? Usually HLLE
is from prolonged exposure to poor water conditions or lack of proper nutrition or a combination of both. Tangs need a lot of veggie matter in their diets, so if you are feeding them meaty foods constantly, over time it can lead to HLLE
, just as an example.
Some more info would help. Also, give this article a once over. Along with giving some cures, it lists many other possbile causes that are theorized.
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