Creating a thriving community tank

[annaGal]

I've got a 75 gallon bow front tank that's been running smoothly for a while now. My current stock includes 2 black angel fish, 1 platinum gourami, 2 rainbows, 1 polar blue parrot, and 2 small Corydoras. I'm looking to add some more fish, but I'm not sure what would be a good fit. The angels, gourami, parrot, and Corydoras have all been together for over a year, but I just introduced the rainbows a few days ago. So far, everything seems fine. My tank's equipped with 3 air bubblers, some artificial plants, and a few pothos hanging in. I'm planning to add more live plants in the future, but I want to make sure I'm not overstocking or introducing any fin-nippers.

[Emeraldsea]

Considering your mix of peaceful and semi-aggressive fish, some apistogramma species might work well, their calm nature could fit in nicely.