aquarium stocking 150 community

Hello, New to this site, been keeping mixed community fish for over 20 years. Generally tropical south american and different catfish. I am upgrading from a 55 gallon (48" long) to a 150 gallon (66" long..weird dimensions). I've never had a tank this large and have no clue what I'm doing with...

I got a 150 gallon aquarium it’s 6’x18”x28” and it’s got 2 Oscars who I love but the family wants a community tank like my 75 gallon in my room. I just helped a friend set up a 55 with penguin tetras Bolivian rams and a king tiger pleco now it’s a cool looking tank for sure but I need some more...