White tip on betta fish fin

I have a quick question. I have noticed an obvious white tip appearing on my Betta’s fin (see picture). His other fins are slightly lighter at the tips but no where near as white as the one that is standing out. Is this something to be worried about? Is it the onset of fin rot or is it just normal fin growth? He is swimming around eating as normal. Tank is a 20 litre with 0 ammonia and 0 nitrite. PH of 6/7 with regular 50% water changes twice per week.
Any help would be much appreciated

 

Happy to hear he’s still alive, I was wondering about him. Hope it works!

 

Happy to hear he’s still alive, I was wondering about him. Hope it works!

Just thought I’d give an update on this. The metroplex seems to have done the trick. I also made a diy filter baffle as I think the water current was quite strong for him when he was sick. It didn’t seem to affect him before but since I have used the baffle he has come out of hiding. He is now back to swimming round all day, his colour has returned and the sores have disappeared. He’s eating normally and loving life again! Thanks again for all your help and advice

 

Awesome! Great to see him doing better

 

Just thought I’d give an update on this. The metroplex seems to have done the trick. I also made a diy filter baffle as I think the water current was quite strong for him when he was sick. It didn’t seem to affect him before but since I have used the baffle he has come out of hiding. He is now back to swimming round all day, his colour has returned and the sores have disappeared. He’s eating normally and loving life again! Thanks again for all your help and advice

Wow, such great news!