Texas Cichlid turning red?

[VPBassist]

I have two Texas cichlids (5" male and 3" female) in a 40g grow-out tank. In the last 24 hours, I've noticed that the male's dorsal fin has taken on a reddish hue. Can anyone think of a reason for this?

Thanks for the help
View attachment 1286603 View attachment 1286604

 

[Aquamojo]

I have two Texas cichlids (5" male and 3" female) in a 40g grow-out tank. In the last 24 hours, I've noticed that the male's dorsal fin has taken on a reddish hue. Can anyone think of a reason for this?

Thanks for the help
View attachment 1286603 View attachment 1286604

The attachments are dead links. No photo.