i think steep personally. but like we said, growth rates of a couple inches a month at least and there are people on here with 36"ers i believe (necro? basslover?). hope you're actually ready...
Redtail cats grow alarmingly if kept properly,2 inches to 12 inches in 6 months is very common,in 2years you have a two foot monster.Dont buy one of these magnificent fish unless you have the resourses to keep it long term,a 10 foot x 4 x 2.5 high would be a minimum to do it justice.In the wild they grow between five and six feet like already suggested,most captives top out at 3.5 feet long....still a monsterous fish !!!!