Your test results are not in the "medium range", they are terrible. A healthy system should have bright yellow ammonia (0ppm), sky blue nitrite (0ppm) and should always have a positive nitrate reading, typically very light to mid orange (10-20ppm). Can you see why I use the word "terrible" in reference to your colours.
In that size of tank, with that stock, you'd be hard pushed to find any filter that could help your cause. A huge sump with adequate bio media relative to your stocking levels would help but the easiest way, as mentioned by everyone, is to substantially increase your water changes and thin out your stock.
If you insist on keeping all those fish and just rely on water changes alone then you are probably looking at anywhere from 50-70% water changes on a daily basis, your test kit will confirm either way. All this is made worse by the fact that oscars and tinfoils are amongst the fastest growing fish in the hobby, so your situition is becoming incrementally worse as time passes....that is if your fish survive or don't suffer from severe stunting due to toxic poisoning.
I'll be brutally honest. Your current plight is not what i'd expect from someone who "understands" the hobby.
In that size of tank, with that stock, you'd be hard pushed to find any filter that could help your cause. A huge sump with adequate bio media relative to your stocking levels would help but the easiest way, as mentioned by everyone, is to substantially increase your water changes and thin out your stock.
If you insist on keeping all those fish and just rely on water changes alone then you are probably looking at anywhere from 50-70% water changes on a daily basis, your test kit will confirm either way. All this is made worse by the fact that oscars and tinfoils are amongst the fastest growing fish in the hobby, so your situition is becoming incrementally worse as time passes....that is if your fish survive or don't suffer from severe stunting due to toxic poisoning.
I'll be brutally honest. Your current plight is not what i'd expect from someone who "understands" the hobby.


