No point flagging me, I don't know what the fish looked like before the photos were taken.
What did the fish look like when you first got it?
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Septicaemia is blood poisoning caused by a bad bacterial infection spreading through the body. Your fish would be dead within 24 hours if it had that and it would not be eating or doing anything except laying on the bottom dying.
The only way your fish can get septicaemia is if it is kept in a really dirty tank and it gets a physical injury that allows bacteria to enter its body. Then the bacteria has to spread through the body and cause the blood poisoning.
Your fish does not have septicaemia.
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If you have a funny coloured light on the tank, turn that off and use a normal light when photographing fish so their colours look normal.
If you have a normal white light above the tank when you took the pictures, your fish is an unusual pink colour.
