parasites?

[Invigor]

Well, I going to give mardel's maracyn-2 a try, because of the absorbtion through the skin property of Minocycline, I think it's got a good chance of killing any possible internal infection.

And for the rest of it, I'll do a 50% waterchange, and try to inject fresh outside air into my tank. Apparently high concentrations of dissolved gasses (o2 and n2) can be a cause of popeye as well. This could be possible as my tank is in my poorly ventilated basement area.