We have 2 Tess. and when we first got them I think we were trying to give them too big of pieces of food and they would turn their head away. Now we feed them thin slices with our long tweezers If we just dump food in the tank, they wont take it and to be honest, I dont know if they can even see it?. The 4 footer is a bit picky and won't even try a prawn.
Cheers! Mark