Fish Dying Mysteriously

[Kennyc]

I have a 400 litre Tank filled filled with Malawai and Tanjynikan cichlids, 2 clown loach, 2 Pimelodus Pictus cat fish. All seem to be healthy. On Saturday I introduced 3 Bristlenose cat fish, since then I have myseteriously lost a trio of Venustas, 2 Zebra, 1 orange lab, plus the 3 new bristle nose all over the last 3 days. None of these fish had any signs of disease or fighting marks. Can anyone please help?

 

[holidayinn]

Hi, welcome to the forum, probably best posting this in the Emergencies forum. Give as much info as you can when you do, for example ammonia, nitrite and nitrate levels and how often/how much water changes. I have no idea what could be wrong, but personally I would do a water change before anything else. HTH.