on no a dead red cherry shrimp!

how long have you had them? Any drastic changes in water temp or ph? Shrimp can be sensitive to even the slightest changes sometimes.

I know you said you had good perams, but just to make sure, what were they? And I'm guessing the tank is cycled correct?

If you are new to keeping dwarf shrimps the first thing I would look at is water. The second thing I would look to see if the other live shrimps have a milky white body or a clear appearance to their bodies (meaning the abdomen section).

if I'm not mistaken I think molting a lot in short periods of time can indicate stress, any expert advice?

it could mean they are about to kick the bucket if they are turning "milky"

Your pH may be a bit on the low side. Personally, I'd like to see it raised up a bit. One thing to consider is that your shrimp was old when you got it and it just died of natural causes and this is no cause for concern. However, if your shrimp are displaying a milky whiteness of their tail (abdomen) areas then this is an area of concern.

The milky white bodies (tails/abdomens) is very bad news. Shrimp with this are more than likely going to die. Many causes for this are suspected--viral, bacterial who knows. But the number one cause is overfeeding. This is most likely due to new shrimp keepers--this is the most likely reason for milky white bodies. I was guilty of this and almost wiped out my entire colony but corrected my feedings and the colony recovered. I am not saying that this is the case with your shrimp. I guess it is just a cautionary tale of shrimp with whitish tails and overfeeding. I hope your shrimp was just an older shrimp and passed from age.