hI Graeme
we have 40+ red ears, 10 snakenecks and six reeves, we feed oxheart, fish and kitten cat biscuits (biskats) soaked in water for 10 mins to soften.
to get turtles eating them use the red ones and feed in amongst some oxheart, seems to get them going, thanks for the tip on pillies have a local baitman who can supply, cheers mark