Mostly I've had tetras, angels, and gouramis. Occasionally I've had platies, cory cats, and swordtails. At one point I tried to convert the tank to all goldfish, but none of them ever lived more than a few months. I really like goldfish and was sad that they didn't work out.
I also like bettas and have had them in lots of different set-ups, currently a 4-gallon tank at work and a planted 10-gallon at home. When the one at home passes away, I'm going to try goldfish in that tank.
Love All Life, Thank You For Posting! :)