HI BEGINNERFISHLOVER! WELCOME TO FISHLORE!
I don't want to disappoint you, but a 5 gallon tank, just can't take more fish! If you want more interest, you could add plants, or shrimp. OR an apple snail. Both shrimp and snails don't really add much bio load, and do help clean the tank, and eat algae.
If you are set on more fish, you could get a 30-55 gallon, after it is cycled, put the fish you have over in it, with some more. Then you could turn your 5 gallon tank into a betta tank, and you could join that BETTA CROWD here!
