My Bronze Corrys Got White On His Fin

[maisy12345]

Hi readings in tank are ammonia 0 ,nitrites,0 nitrates 0 ph 6.6 ,noticed last night that my corry has gotwhite on his tail ,is this fin rot and how to i treat it?

 

[maisy12345]

Anyone?

 

[adgieman]

is it white and fluffy or white round the edges? any pics?

 

[maisy12345]

the white patch om his tail sems to have faded but still slightly visible,just keeping an eye at moment ,thanks for your reply