Something Really Not Right

[spectrum]

Something has gone wrong somewhere. 3 of my danios and 1 of my guppies are frequently harrassing each other, but the guppy is standing up for itself. all four are against each other. The top part of one of the danios tails is missing
All 4 of them ( including the danio with half a tail ) swim around at the top occasionally attacking one another.
I'm at a loss at what to do this has only happened in the last couple of days
Any help i would greatly appreceiate.

 

[arobinson1984]

Danios are fin nippers so that will b the reason they are attacking your gupy.

Andy

 

[WILDER]

Guppys and danio's don't mix.
You will have to think about rehoming the guppys or danio's.
I would issolate the guppy for now.

 

[spectrum]

The danio now has virtually no tail at all I think he will die
I might try to give the danios to someone.
Thankyou

 

[WILDER]

It dosn't sound good for him.
He will just get weak trying to maintain his balance in the water.
I would issolate him.