Pink fuzz in betta tank

[Ittybitty]

I have had my betta for about 7 months, he's in a 8L filtered tank and I clean the water regularly (every 3 weeks or so) and also try to do a 50% change in between. I also have a heater set to 25C in the tank. In the months I have had Giovanni, he has had swim bladder and fin rot, which is really surprising because I am so so scrupulous about his cleanliness and hygiene.

I will admit I recently went through a period without doing a good clean for about 5-6 weeks because of work.


Anyway, it was then that I noticed this pink fuzzy layer on top of his rocks. I cleaned it out about a week ago thinking it was just food build up. But I noticed it again on Thursday, so in 4 days it came back and it is much worse than before. Giovanni also doesn't look the best, he has white spots on this fins and body, and I am worried he is going to get really sick and die

PHOTOS ATTACHED

Anyone know what this could be?

 

[JC_Bus]

It could be food that is just old. That is making the water toxic and that could be the reason why your fish doesn't look like what he used to


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[Ittybitty]

That's what I originally thought, but the photos I posted are after 3 days of me cleaning the tank, which is really odd.