Fish to add?? 37 gallon tank

[Dust19870]

I am new to the whole fish world and would love to hear some suggestions if possible. I currently have a 37 gallon fresh water tank with 5 head tail light Tetras, 3 Odessa Barbs, and 2 Bloodfin Tetras. I now know that I probably should have bought more of the Odessas and Bloodfins but all of the fish seem to be working really well together. I am looking to get a couple more fish but not sure what to get. My girlfriend really wants an angel fish but I have read that they can be pretty aggressive so I’m not sure if I should get one or not. I am also searching to find a “showcase” fish to put in my tank but would love to hear some input as to what I should get.