This is a better picture.
The tank i have is a jebo3300, with the filter built inside the lid.
Thanks

I would strongly advise you to rehome the catfish, it will only end up with you having poor water quality. it sounds as if you've got bio wheel filtration. Not so common over here. Could you make your photos a little bit smaller before posting them?

given the size of your tank and filter I would rehome the cat, or u will have problems.. I think a 6-7inc mate will be ok with oscar he shouldnt eat them. checkout the site for tank mates and if you must have a cat get something a little smaller that will not grow to be a monster ). maybe try to do a deal at your local store.

Your oscar looks ok to me. Good body colour

I am in agreement with the others, the eel has to go, its just too big for your tank with an oscar

Get tankmates that dont get so big. I do understand the problem you have tho, any fish you can buy are small and would end up being eaten.
You can either shop around and hope to find more mature fish, get a smaller tank to grow them up in, or put a divider in to keep them apart until the new fish is too big to be eaten (this can take a while). You can always try asking a shop to get you larger fish in, sometimes they can do this but you have to trust them as you dont get a choice

i also agree with the majority. rehome the eel and if you feel the need for a tankmate for your oscar maybe try a mis size pleco.

Thank-you very much for your help, Oscar looks much better today, and i will definately get rid of the eel tail catfish. Thanks again.