Why do you continue to ask the same questions over and over again? Many members have given you great advice and on your last thread the consensus was that 1 oscar, 5 silver dollars, and the catfish would be maxing it out to which you agreed.
When you go back to ask the same questions you already have been given the answers to you waste the time of every member on here who went out of their way to help you. Unless you get a bigger tank nothing is going to change the answers people had already given you on the last thread. All this will do is make the experienced and helpful people on this forum no longer want to help you moving forward.
I understand you're young and learning, however, keeping living things are not the same as having your parents buy you a toy. You can't ask multiple times until the answer changes from no to yes. These are living things and you have to show them the kindness and respect they deserve. If you do that then everyone on here will love and respect your dedication for not just keeping, but caring for your fish and by doing so you will help set the standard of fish keeping for all the new incoming members joining the hobby to see. Give them the same love you would to a dog, cat, or any other pet.