Hope somebody can help. I have two snakeskin guppys. They have been absolutely fine until the last two days. They now have completely shredded fins. The only thing I have added recently is a lyretail killifish. The two guppies used to bully and eventually killed my other guppies but always worked as a team and never hurt each other as they were of the same markings. They are in with neons, gouramis, harlequins and the solo killifish. Their top fins are practically gone now so pretty worried bout them. Any ideas? Have no tank I can move them too!!

easy mistake though I suppose as the seem well behaved in shops when there are lots of them and they have no territories to protect so its easy to mistake them as nice calm little fish.