Brook strikes again

[Dawneme]

So my system has been running for atleast a year, i have 3 clownfish in that tank and a very very while ago two of them got brook out of the blue and didnt make it, while my last clownfish lived till this day, and for much time none of the fish that came got issue with the existing brook... until last month or two my last living clownfish showed signs of brook, and it still kicking, its not lethargic, its still swimming the good ol up and down clownfish swim pattern, chowing down on every food given pellets, mysis, bbs the usual

Should i be concern of this?...
I would love to show a pic of it, but its on the white parts and my phone camera doesnt not showing it well atall

 

[vetteguy53081]

So my system has been running for atleast a year, i have 3 clownfish in that tank and a very very while ago two of them got brook out of the blue and didnt make it, while my last clownfish lived till this day, and for much time none of the fish that came got issue with the existing brook... until last month or two my last living clownfish showed signs of brook, and it still kicking, its not lethargic, its still swimming the good ol up and down clownfish swim pattern, chowing down on every food given pellets, mysis, bbs the usual

Should i be concern of this?...
I would love to show a pic of it, but its on the white parts and my phone camera doesnt not showing it well atall

Images/video will be of great help as any other assessment would be a guess in lieu of actual issue/cause. If brook, some signs will be lethargic behavior, refusing to eat and heavy breathing from the mucus.