google D. rerio. They have been heavily studied for their regenerative properties. Their dorsal fin can be completly removed and it will still grow back.
There is a difference in being "fed" and what the fish does by nature. You can fed an Oscar once or so a week, but if you drop in 30 feeders,
Sol, I recently had the tail grow back on one of my silver hatchets in my 10g shrimp tank. No idea who/how it happened, but one day I noticed it wiggling
I agree with Freshy. You should just go with a 10 gallon. it will be more fun to work with (aquascaping, cleaning, filter and light selection) you have
I wish I knew what happened, I hope I didn't somehow do it while netting the fish.