Fish fins

[Jorro3]

It seems today my fishes fins are turning a yellowish-brownish color. Maybe they have been like that but I don't think so, what could it be and how can I solve it?

 

[Hholly]

It's possibly fin rot. Testing your water with a good liquid test kit would be a starting point. Test strips aren't really accurate.

 

[Jorro3]

What do you do for fin rot?

 

[Hholly]

Improve water quality. Lots of water changes.