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I bought a Betta for my daughter that has quickly become my 5th child. We bought him from Petsmart, as I knew little about where else to go - especially with Covid19. He is in a 3.5 gallon (13 liters) tank with a filter that was advertised specifically for Betta fish. I conditioned the water and added a heater.

When we brought him home, his fins were curled up though they seem to be releasing a little more now but not fully. He seems to dart around a bit and then hid behind his filter though he will come out once and a while and be playful. Its been 5 days and I’m worried he might have issues with his fins and if there is something more I should be doing. His fins have a few black spots on them. I will get a water test kit tomorrow to ensure we have the levels right. Just wondering what you guys think. Any suggestions?

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I see nothing wrong with the fins of your betta. There is that darker spot on its forehead that might indicate a problem, but even that is within normality.

If you notice a change of behavior, then you could go to the vet to have a look.

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  • Really? Glad to hear it. Do juveniles often have curled ventricle fins?
    – Sarah Wayland
    Sep 11, 2020 at 3:07
  • As I said, all fins look beautiful. There might be some deformation of the pectoral fin, but it might be also an illusion - the angle in the photo is not suitable for good evaluation. BTW, "ventricle" and "ventral" are different words :)
    – virolino
    Sep 11, 2020 at 13:45

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