Very beautiful crystal red shrimps. Either CRS or blue tiger shrimp will be my next shrimp species on the wanted list.
Have you had any other dwarf shrimp species in the past?
How much did it cost you for 15 of them? SS+ doesn't come cheap. Where did you buy them?
You also need to be very careful. Since crystal red shrimps are the result of generations of selective breed, they are one of the most sensitive dwarf shrimps in aquarium hobby. You must keep excellent water quality. Rather feed "not enough" than "too much". Once your tank is established longer, there will be natural occurring algae for them to feed on. They only need very little extra food supplement.