My Koi are dying :-
Two weeks ago there was a bout of fungus - This was treated with a
fungus/blanket weed cure (can't remember the name). The problem was
still apperent so after a 30% water change the treatment was repeated.
The fungus has now gone but some Koi are laying on the bottom
motionless - They react if a net appears close and bolt round the
Problem is they are dying and I can;t explain it !
Water tests are good accros ammonia nitrite nitrate etc but
I did add 100KG of sand to the filer about 10 days ago - the sand
was advertised as sterile for use in a childs sandpit
The UV is running and the water clear
Help my favourite one looks next - performing water change tonight !