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hello i really hope someone can help me i keep getting very high nitrate readings between 80-120 i keep doing water changes still not helping i have already lost my discus. my fish are fed mainly on frozen bloodworms & some flakes they are not over fed and the filters get cleaned when suposed to i have a sponge background which come with my 120ltr tank which makes me wonder if that is the problem. my tank has only about 15 fish in it mostly small ones like neons so i cant see that being the problem. could you please help.