Fin rot???

[Tsn]

I noticed my flowerhorns tail has a black edge around it and it has a split in it. No other fish could of nipped its tail. Is this early signs of fin rot? Water quality is good. I do tend to feed maybe a little more than I should. I do 15% water changes every week. Hes a dark color because I just turned the light on. Hes in a 70g with a smaller texas cichlid and a bristlenose pleco.

 

[Tsn]

 

[kno4te]

Don’t look like fin rot. Would increase ur water change to 50% per week and I’m sure it’ll get better. Update as u need.

 

[Justchill]

Looks pretty normal, google flowerhorn and look at pics, the black tips are pretty normal