so i have the 75 gallon with two oscars
now i have two aquaclear 110 on it do you think this is to much filtration or to little of filtration?
also would it be best to throw out the carbon and just add another sponge for more good bacteria growth in the filter?
thanx

i forgot to add that they run about 500 gph so they say a piece
so in total would be 1000gph on my 75 gallon tank

Your filtration is okay for a 75 gallon tank, although it's not really big enough for two adults Oscars. Yes, remove the carbon and replace it with mechanical or biological filtration, preferably biological if you already have mechanical