I used to keep a small kiddy pool in the back during the summer as my fish pond. lol
In it I had bullheads, rock bass, sunfish, largemouth, gobies and perch at different times.
The best survivors were bullheads but as fall neared they for some reason died, full of worms. I have to say the most entertaining with rock bass though. I was absolutely astounded by how well they could hide, in the most unlikely places. Sunfish were rather boring, they just schooled and circled the middle of the pond until I fed them. Gobies died almost instantly. The perch got attacked by a raccoon and the largemouth was really sluggish, but was entertaining to watch him feed. I ended up releasing him in the fall back to where he came from.