Coloured Widows Biting My Gkf Tail! :(

[wesarl]

hi guys, im kinda new to this so please bare with me.

i have a ghost knife fish in my 4ft aquarium with 2 angels and 4 coloured widow.
all was well until i saw my GKF (Ghost knife fish) tail was bitten and red. After watching it for a while i noticed that the widows were going for his tail.

can anyone please tell me why this is happening

 

[fluttermoth]

Widow tetras are very nippy fish. You could try adding a few more, so they keep the aggression between themselves. That often works but there's no guarantees, I'm afraid

 

[wesarl]

just bought 4 more widows to make a total of eight.... and all is well
thank you so much fluttermoth