In a fresh water fish tank how long do they last?

Answer 1

How long does what last? The tank lasts as long as it isn't cracked, The filter lasts as long as it is cleaned, and you must do efficient research on the specific fish you have in mind for its lifespan. And by the way, this site doesn't count as efficient research.

Answer 2

Goldfish? That depends on the size of the tank. Let me start of by saying goldfish will stunt their growth in a tank that's too small. And for a straight bodied, 1+foot long Carp, almost all tanks are too small. What I'm about to say isn't officially written anywhere, but this will help you out best. All Common, Comet, and Shabunkin Goldfish should be kept in, at least, 5 foot deep, 20 foot wide pond(for them to live to their longest, of course.). Or, an 55+ Gallon aquarium(For one only). Pet store clerks don't tell people these things. Who would pass up the chance to buy a 33 cent 2 inch fish right?