In the Tropical House. The larger pool behind has a few piranhas as well as some very large Pacu and catfish (including a stunning [i]Auchenoglanis[/i]).
The Palms Tropical Oasis will close permanently on 5th September 2010. Not a major zoo but always reliably interesting and somewhere I've been going for years. I made my final visit after spending the morning at Hillside. So long, old chum.