It's not exactly a spot, it's long in shape on the dorsal fin.The fish is very active and eats well. I've had him for a couple of months and mentioned to the LFS
that he had a tiny white spot on his fin which showed after I bought him but then it disappeared. I came back from holidays and it's quite large. He is not exhibiting signs of distress ie rubbing himself etc. I looked up lice but don't think it's that. I can't see it moving at all.
the PH is currently low at 7.8-8,Phos 0.25 and temp around 25.2 - 26.8 overnight ( cooling tank with fan- will hold at 25.2 if on 24/7. Have bought a chiller and connecting it today) These are the only factors I can possibly attribute to what could be affecting his health. Thanks
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