YES Arugula (aka Rocket) is a perfectly acceptable addition to gutloads. Rocket is a good source of Protein, Thiamin, Riboflavin, Vitamin B6, Pantothenic Acid, Zinc and Copper, and a very good source of Fiber, Beta carotene, Vitamin C, Vitamin K, Folate, Calcium, Iron, Magnesium, Potassium and Manganese.