Danios Attacking Guppies

[homerhotspur]

Added 2 Male Guppies to tank last week and all has been perfectly ok.

Yesterday, found one of 5 Zebra Danios dead( long finned) for no apparent reason. This morning the remaining 4 Danios are attacking the 2 Guppies. Any ideas PLEASE?

 

[WILDER]

Size of tank in gallons or litries.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

I would issolate the guppys.
You might have to rehome them if the danios are fin nipping.