Sykith.,
Welcome, cannot help with the shrimp question. Lots of information here about food, mostly homemade using beef heart or lean beef, turkey, shrimp,fish and green veg. More information on this site than you can study before the end of the year. I would highly encourage you to Waite until you can afford a 70 gallon tank, a 55 is too narrow for six discus in my opinion. Every hour you study before buying will save you a lot of pain and lost money. Where are you going to school and where do you plan to move after you finish school?
Ron