i fed my RCS NLS Crstacean pellets and mix it with Fluval shrimp granules. The RCS got redder in the process. I only feed them once a week with that. THe amano are not a fan of the invert food, they prefer algae wafers and algae. So if the RCS get to the algae wafers before the amano, their gain. The worst is my GMS Yo who is always slow at getting to the wafers. The betta, amano, RCS always get there before he does.
BUT you do not have to feed them the invertebrae food, it's just that it has a higher calcium content, more like supplements IMHO. they are just happy eating off unfinished food, if any at all, on the floor. Most of the time they eat algae and I think they do need to be fed with some wafers at least.