Thanks for your replys.The turtles in Rotorua are young but the fish would be about 12-15 cms long.I have managed to purchase some larger rocks and some gravel and am looking at maybe a log to put in his tank.He loves to flick the gravell around.I think if I did get fish for his tank I would like to have made and designed a few places they could escape to.Unfortunatly their doesnt seem to be any breeders close by so will have to come back to Rotorua and visit the pet .