hi
After doing the tests the Ph is 6.8, both ammonia and nitrites are just below 1 , all seems to be in order there.
The tank seems to fine now, i put the sick/injured looking danio into the freezer the other day
Then i read what Matthew had posted on here, and i thought about it and maybe that was what had happened?? but it didn't explain why the others had died.
I added about 5 more plants the other day, some java fern, babies tears and some blue ma(something or other) so there is a nice cover for the danios to hide! and the remaining bristle nose loves them!!
Thanks for all your help! it is greatly appreciated!