Problem With Angel's Dorsal Fin

[fluttermoth]

I thought my angel's touch of fin rot had sorted itself in quarantine, but s/he has been in the main tank for a couple of weeks now and it's not improving. I'm not actually sure it is fin rot; there is no fluffiness or redness involved

Tank details;
240l
APS 2000lph external
ammonia 0
nitrite 0
nitrate 30 ish
26°C

Stocking;
approx 40 false neons
12 marbled hatchets
5 adolfoi corydoras
6 glass cats
one red whiptail and one clown plec, plus the angel

Here are the best pics I can get;





It looks pinker in the pics than it does in real life; I assume that's my lighting or my phone cam!

I've already tried courses of Interpet anti fungus and fin rot and Myxazin (separately, with water changes and carbon in the filter in between) to no avail

Anyone have any suggestions? Seriously considering pulling the fish out and cutting the fin back, but that seems rather drastic. My friend suggested it could be genetic; certainly veiltailed angels do seem to get slightly 'tatty' fins as a matter of course (well, all mine have), but I'm just not at all sure.

Apart from this issue, the fish is in fine health; eating and growing well and showing no signs of illness or distress, and no other fins are affected.

 

[Chad]

No sign of picking by other fish?

 

[fluttermoth]

No, none; and the tank is right next to my computer desk, in my bedroom, so I can watch it a lot of the time.

 

[Electric Warrior]

Have a look at this old thread of mine on here from when I kept angels.  Does it look anything like the pic of my angels in that thread?  I wasn't exactly sure what it was either, but I (a little hesitantly) followed Tolac & Snazy's suggestion, and it went away, whatever it was.  It's difficult to see from your pics whether it looks anything like what I had?
http/www.fishforums.net/index.php?/topic/407365-new-angels-possible-fin-rot/

 

[fluttermoth]

It doesn't look quite the same but I've done chlorinated water changes for my oscar when he's scraped himself before with good results, so it might be worth a try, I hadn't thought of it; thanks

 

[fluttermoth]

Well, the fish has now had two courses of Esha 2000 with no improvement, so it's gone back into the main tank.
 
Here's how it looks today;
 

 
As there's been no change for better or worse, I think all I can do is watch it; the fish appears to be in perfect help otherwise; growing and eating very well and behaving normally.