wow, your nitrates are high. how big of a tank is this lion in. lions poop alot, im assuming thats where the nitrates are at 20. id suggest doing a water change. ive raise many lions, ich is a problem but when you start noticing cloudy eyes it gets harder to save them. i found that many medications are very strong for lions. when medicating lions in quarentine they tend to sloth their skin and loose their colors.
id pay attention to their eyes and keep up with the waterchanges. try getting those nitrates down.
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