help Need help ill fish

Cackett

Large Fish
Oct 22, 2002
406
0
0
43
Basingstoke, hants , UK
#1
i added some plants and ferilizer at the weekend and now i have had a dead fish for the last 2 days ( one had a hole in his side and the other not sure) i think it becasue the plants that i added have messed with the nitrite level but im  not sure any ideas??
i have to cheack the nitrites tonight.. just hope when i get home the rest are ok.. :'(