Mine feast all day long on biofilm on the plants. My "must-haves" would be Multipara and Shield. Like Peachii and Laki, before I got non-shrimp inverts, I only fed once a week or so.
I couldn't feed algae wafers in Willie's tank because he would zero in and scarf down. Si ignores them.
Laki's right about substrate color: To make reds "pop," use black. It's amazing the difference it makes.
I would guess if your red and rili bred, you would get regular RCS. But someone please correct me if I'm wrong.