WELCOME TO FISHLORE! The easiest way to combat fry is only have male platies
Cory cats need to be in schools, so I'd boycott the tetras and add two more corydoras.
It may be difficult to get a male and female ram to live together, you'll need a proven breeding pair, and that gets very expensive, and you get a lot of fry. I'd go with just one. ALso, they are senstivie to new tanks, so add him 6 months are the first fish aare added.
I'm sure you're aware of the
nitrogen cycle and how to cycle fishless, but sxtill click on the highlighted thingy and make sure
Good luck!