What to do about fin rot

[PerfectDepth]

It looks like my Honey Gourami had his tail nipped by one of the harlequin rasboras. After a day and a half, it doesn't look any better (or worse). It's a small half-circle "bite" out of the tip of the tail.

I'll be doing 25% water changes daily. Is there anything else I should be doing?

Edited to add:
He is stressed - clamped fins and he hides in the corners. He still behaves normally at feeding time though.

 

[HUKIT]

There is nothing more that can be done than your already doing, keep the water pristine and it will heal(this takes more than a couple days).

 

[PerfectDepth]

Thanks for your reply, but the poor guy didn't make it. He died yesterday.

He obviously had something else wrong - I had him in the tank for about six weeks and he seemed perfectly healthy and normal until just a few days ago. Whatever it was, at least he didn't suffer long.