They grow faster than you would expect. They aren't likely to reach 3 foot in an aquarium, but a solid 18 inches is possible. I saw a few of them dumped in Florida waterways at up to 2 feet. They weren't just long, but wide bodied and heavy. They had destroyed those streams.
A 90 will work for a bit, depending on the length of the front glass. If it's a 3 foot one, no, but a 5 or 6 footer will do. The thing people don't consider isn't just tank size. These are big fish, heavy bodied waste producers. There's nothing ballerina like about that fish. And as a big, heavy, waste producing fish in a 90, its tankmates will have to go. Yes, it can live in most 90s, but its bioload means it really should live alone, with excellent filtration and lots of water changes.
Not now, but in a year or two.
I was in a store once that had had an "adoption" policy for big Loracarid catfish. They would accept them from hobbyists, say they'd phone someone who wanted one, wait a few hours and then euthanize the fish. It was deceptive, but in some weeks, they could get 2 or 3 big ones (they didn't sell gibbiceps or common plecos) and they couldn't be placed. People who have large tanks usually dislike them. There are a lot of such "what, no, we aren't a kill shelter" places, trying to cope with them. Your fish has a better chance of a longterm home returned small.
