A friend gave me these awful looking algae wafers, insisting her fish were all over them. I tried to ignore the bright green and dropped a couple in both tanks. The yoyos stuck to them like flies at a picnic (as did the kuhlis and angels for that matter), but the other tank got a passing interest from the cories, a competitive hog-pig fest from the guppies, but an all-out stacks on food fight from the MTS! I've never seen them move fast, let alone this fast. In a matter of maybe a minute both wafers were covered. They can stay a treat for the yoyos only. My MTS dont need breeding encouragement by fattening up with too much food! Also, the yoyos just don't seem to eat my snails! I guess they prefer horrible artificial wafers? Maybe it's the McDonalds of fish food.