Originally Posted by Mavi
How big do plecos grow to be? I've heard different things about growing based on the size of their tank (like a goldfish) vs. growing without abandon.
No fish "grows to the size of its tank." This is a myth. The fish become stunted and ill and die prematurely. A pleco will grow to two feet, and can outgrow a small tank very quickly.
As for goldfish, they have a lifespan of 20-30 years (and I've heard of Koi carp living much longer.) Goldfish forced to live and become stunted in little bowls or small tanks die within a couple years more often than not, at only a fraction of their normal lifespan.