You don't need the Ammo Chips. From what I've read, they can actually stall the cycle. Instead, do daily 25% water changes. I would recommend doing a 50% water change initially to get down the ammonia level and then do daily 25% changes. High Ammonia levels will harm your fish and will stall your cycle. Two oscars is alot to put in an un-cycled tank. They are messy fish so you may need to do slightly more than 25% changes a day. It just depends on what your water readings are. At this point, don't use any chemicals that reduce or bind ammonia. Water changes will achieve the same results in a healthy mannor and will be easier on your fish. What is your current water changing schedule? How are you testing your water (strips or liquid test kit)? If you can replace the carbon with Ceramic rings, that would be better. I'm not farmiliar with your filter so I'm not sure if you have the abilities to do that. Also, something to take into consideration is upgrading to a Canister. Oscars are very messy and will need over filtration.