Do fish get diarrhoea?

[jordanhunt]

I just looked a my severum and I noticed he had white spot on his fins, so I immediately treated the water and raised the temp, as I was watching him I noticed that he did a poop, but it looked really wet and disappeared into the water like a liquid, what is that


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[EBJDguy]

Could be parasites. Treat with 3% magnesium sulfate just in case.