I recently added 6 x Rhomboocellatus Barb and 6 x Black Phantom Tetra to my tank of 6 x Zebra Danios.

I noticed on Monday evening the new fish had white ’salt like’ spots on them.  Yesterday I was at Silverstone but I did manage to purchase a bottle of King British WS3 treatment on the way back home.  By the time I arrived home (midnight), the Barbs & Tetras had died.

I have removed the dead fish and carried out a large water change.  I’ve added a dose of King British WS3 treatment and will continue the medication for another 10 days.

The orginal Danios are all swimming about quite happily. Water conditions have remained at zero ammonia and zero nitrite and the temp is currently 27c.