i have 2 silver dollars in my 30 gallon tank with my convict. it seems that they only eat the leftovers of the convict that sink to the bottom and they are not good at eating from the top. i can make flakes sink but i want to give them better diet. how do i make other foods sink (bloodworms, krill etc) i know they are herbivores , so what vegatables can i feed them? cucumbers?

