What fish can i put into my 55 gallon tank?

I have a 55 gallon tank. Ive always been a fan of Angelfish but i don't want only one kinda fish and wont get Angels if they're to hard to care for. What are some good combination for a 55 gal? I want something colorful that wont get to big. I like the idea of schools of fish darting around and some being kinda active. i breed guppies so have 2 20 gallon tanks each with an assortment of guppies, 2 cory cats and 2 otocinclus. plus a 10 gal tank for fry. Anyway... i just want something really neat. i have alot of plants and decorative stuff that i can use to give the tank more hiding places if i get fish that need them. im thinking its all going to be artificial plants though. i tried getting real plants to grow but never had any luck. I had an oscar so i always left the tank with just a few plants on each end and the middle open so he could swim. He recently passed and my dad said its probably because he was really old. so now all that's left in the tank is a plecostomus. ive had him for years so hes done growing and not to big but i dont need any algae eaters unless you think he needs help but hes been good for all the years ive had him. What are some good combos? thanks! :)