What is this white patch on my betta fish?

Yesterday i noticed my betta had this white patch on her gills. It's very bright looking almost like illuminated. It's on both sides of her girls but the one side looks a lot brighter. Please help me fix this!!

Ive done a 25% water change as well.

 

Could you circle it? I’m not seeing it.

 

I'm not sure if this is a part of her marble gene or not I'm just a little worried

Another look

 

Was it not there before? How long have you had the fish? It's not looking like a growth to me.

 

Ive had her for about 6 months. It wasn't there before.

 

It looks like iridescent coloring. A marble betta will change colors in its life. I have one too I’ll find a pic. Does it look blue under the light?

This is my boy and his cheek and back has the same color and sometimes it changes a tiny bit. It sometimes looks white or sometimes blue




by the way, she is beautiful and looks healthy to me

 

Thank you so much! Your boy is stunning! Im glad to know she is ok and it is just a marble gene.

 

That iridescence coming through could just be because you're feeding it better or it's generally healthier than it was before (which stands to reason). I think if it were a dangerous growth (I had one die of a growth) it would stick out from its body like a lump, or there would be irregular scales.

It being just on one side calls that into question, but obviously the coloration isn't symmetrical so I can still see it as just being his colors coming in.

 

Thank you so much! Your boy is stunning! Im glad to know she is ok and it is just a marble gene.

Thanks! If you have a light in your aquarium, you may notice that iridescent part really pop when she swims under the light. Super pretty