Thats what i mean if im takingThats true but eventually they would be affected if problems were not corrected. I suggest doing weekly wc's especially whie keeping Oscars they are the biggest contributor to the bio-load of the filter.
All the right steps why is the ammonia and nitrate still high even dhow i feed my fishes so little at times every other day considering got such a big tank with so little fish these problems come from over stocking and feeding