well unbelievable as it may sound, over the past days my siamese tiger has grown quite fond of pellets meant for cichlids and cichlid tucker. Infact, from not eating anything about a week ago, yesterday I saw him steal a hunk of cichlid tucker right from my giant gourami's mouth. So there you have it, they don't necessarily need live food. I guess he got so hungry he had to eat what I gave him.