NorthFin Kelp Wafers 14 mm Fish Food, 2.5-kg bag; Help make sure that your finned friends are being fed a nutritious, balanced diet with the NorthFin Kelp Wafers 14 mm Fish Food. This fish food is specially crafted for Plecos or other bottom-dwelling feeders with kelp as its main ingredient. Plus, it’s formulated without any fillers, hormones or artificial colors. It’s even designed to promote an easy digestion. This food can be used as an alternative to algae wafers.