I have two, pure monster IMO. He ate a 7" barracuda when he was 6". They are tank mate annihilators. You have to make sure yours are the Zungaru sp. because the smaller ones only get about 3"
Zungaro zungaro is now the scientific name for the Jau catfish. It is under pimelodid catfish not pseudopimelodids. The change was made a few years back I think in 2003 or sometime around then. Zungaro zungaro was formerly Paulicea lutkeni until the recent change.