Hi! I'm having my first pair of goldfish and one of them had a really beautiful pattern in orange white and black that I really liked. But around one week and a half ago I had to go and left my fish tank at home (obviously with a food dispenser hehe) and being unable to clean it and make the water change. When I got back home the fish tank was covered in green algae and my fish lost all its black spots!
Could have it been caused because the water needed to be changed? Or I've also read about a black spot disease on fish... but my fish was like that when I got him so I don't know what to think
Can anyone please help me? TTnTT
(PS. I posted some photos so you can see how it changed and also this link to a video I posted of them (Link is not visible to guests. Please register to view.