Good schooling fish for 75G

I have a 75 gallon community tank. Current setup includes:
- platies
- julii cories
- khuli loaches
- a bristlenose pleco
- an angelfish
- cardinal tetras
- a few danios and a CPD I rescued

I am looking for a new schooling fish for my centrepiece. I love my cardinals, they school nicely, and their colour is fantastic against all the green and brown in the tank. However they’re not doing well (they have dermosporidia and I’ve run out of options to treat it), so once they are gone I’d like to get a new set of schooling fish since I don’t want to deal with this again. Was considering just adding more CPDs, but do they school well or do they hide a lot? Any other suggestions of something with nice colour that’s active?