It looks like your pink fish has a broken back. Hard to tell from the blurry pic.
I would not get either a Oscar or Aro just yet. Wait a few years and keep smaller/cheaper fish at first and learn from your mistakes. Sometimes it takes months for things to build up to where you run into a problem, you've only just started. Besides, you would need much larger tanks for the Oscar or Aro. If you plan to buy a fish, plan to keep it for life. Don't just buy a fish to keep it in your tank until it no longer fits. A fish should always have more space than it needs to grow, which will help it grow faster and larger.
X2 on the metal stand. The angle bent into the iron doesn't help.