Guppies Tail Turning Black Help!

[AdrianJames]

Hello all,

I have always kept guppies and have never seen anything like this..

My orange Guppies tail is slowly starting to turn black or darkish. Before this I noticed little snips out of its tail, I was worried about fin rot so I dosed Melafix into the water which usually clears up the problem (having done this in the past)
I dont know what to think of it. As I said I have never come across a guppies tail turning black especially when he was such a bright orange. I have also changed 25% of the water and my Nitrate is perfect and Nitrite 0 and Ammonia 0.

HELP!
I think he will die tomorrow...

 

[FishLover4+1]

Is he still swimming ok???
if he isn't make sure he can't get stuck to the filter intake. that happened to one of my fish and she died within a minute. (i think she had dropsy so i put in some aquarium salt and left the filter on while i rearanged my fry nets to stop her being blasted by the filter, next thing i knew she was gone)

 

[MegaZerino]

what is your ph? i went to my lfs today and ecause my water has a ph of 8, he said that because its an alkaline it could be burning my bettas tail aswell as the fin rot

 

[AdrianJames]

what is your ph? i went to my lfs today and ecause my water has a ph of 8, he said that because its an alkaline it could be burning my bettas tail aswell as the fin rot

My PH is 7 which I have always had for guppies and have been successful in keeping them.... confused...

 

[MegaZerino]

i was thinking it was alkali burn, but if its 7 then its not. maybe it is just fin rot

 

[AdrianJames]

He died... no idea what happened.