You should read the catfish page where they have a sticky for a RTC. They can get 5 feet plus in the right environment and live to 20 years or more if taken care of properly. The record caught RTC is over 5 feet and 100 pounds.... And that TSN will get 4 feet as well. A RTC needs a minimum of 1500 gallons for itself.....
darn that is upseting and what are the odds of the actually getting that big? I MEAN LIKE 5 feet caus i thought as long as they had the capability to lie side ways they were fine
RTC do get huge but I don't think it would take 4,000 gallons , although it would be AMAZING to be able to provide a 4,000 gallon tank , I know of a few member keep them in 600 gallon tanks