I think what Soothing was trying to say was to try and avoid products that may promise enhanced colors. Genetics play the biggest role there.
With that said, you're on the right track by wanting to purchase Painted Fire Red shrimp, since they are easy to breed and a good starter shrimp with nice red coloring. I've not tried Ebi Dama myself, but I've read good reviews as a staple food. You'll find that certain shrimp will prefer some foods over others. For example, my Orange Eye Blue Tigers prefer plant-based foods, like spinach, Cologne Shrimp Food Omnipro, and Tantora Mulberry Plus, whereas my Bloody Marys will eat those above plus meatier foods like Mosura Gravidas, and Shrimp King Protein. Take your time, try stuff out, research on this forum, and feed sparingly.