Im not familiar with that type of food (is it pellets or flakes?) but i agree with the peas. Plain, frozen peas that have been cooked for a few minutes in the micro. Make sure you remove the outer shell and mash them abit between your fingers before feeding. I feed my goldfish peas a couple of times a week and they LOVE them!! Try feeding only peas (and skipping the other food) for few days and see if this helps.
The thing is that I have heard bad things about feeding vegetables like that they pollute the water and cause bad water quality.
The thing is that I have heard bad things about feeding vegetables like that they pollute the water and cause bad water quality.
I asked my local aquarium this question a while back about if I should feed my plecos vegetables and they told me no never to put vegetables in the tank.