I've kept 2 in the past. Both grew quick by Dat standards in my 100G. Only sold them as my planned upgrade fell through. Sold one at 9" and the other at 12". Had them from 2" and they took pellets from day one. Had them for just over 2years too.
Never had problems with them, they ate anything but the bigger did bully the smaller a bit mind. Nowhere near as skittish as the IT and NGT which I had (and I've lost for unknown reasons).
Heard of Sudden Death Syndrome in NTT but guess I perhaps didn't have them long enough to experience this. The best specimens I've ever seen on here belonged to Chaitika and Marvinbaker-search for their old posts and you'll see just how nice a large NTT can look