What Type Of Fish Has The Best Chance Of Living

[times9]

what type of fish has the best chance of living in a 20 gallon fresh water aquarium. I guess what i am asking is what types of fish have the best odds of living the longest

 

[Aphotic Phoenix]

Most fish species have a lifespan that falls between an average of 4 to 15+ years (usually around 4 for smaller fish like tetras, while some larger fish live 10-18). Some fish are more delicate than others however. Zebra Danios are quite hardy, and are an appropriate size for a 20 gallon. They do best in a group of 6 or more.