My 1st pair. M&F. I trained them to eat other foods. Slowly add new food to what they were eating. I did this by spot feeding with a large eyedropper. Soon afterward when they saw it... they came right up to it and bumped it. I couldn't squeeze it softly fast enough. I regret to this day of giving them to my friend. Now, what I did for my new male scooter was... I kept him in a 10 gallon QT tank. I trained him to eat frozen, and each few days I mixed in a new type of food. Now he eats, brime, mysis, sqid, daphina, silverside, tobiko, bloodworms. To this day, when he is hungry, he will come up to the front of the tank when he see's me and swim back in forth. I have a 28" deep tank which seems all the piggies gets some of the food before him. So, I do have a special place that I will make sure he eats enough by spot feeding him.