I feed it every day. The package says, "Roasted Seaweed" and there are no other ingredients on the label. I do not rinse it. The texture changes drastically when it gets wet and rinsing it would be counterproductive, IMO. I take a piece about 1" x 2" and fold it in half. The I cut it into strips, leaving an uncut area where it's attached to the clip. This trick makes it easier for them to eat and reduces the amount floating around the tank not eaten.