Shrimp Dying?

Hey guys, so I have this 10 gallon shrimp tank.

It has 6-10 yellow shrimp(a few berried females)
10 tiger shrimp
5 RCS(my angels ate my other 100? (in a breeding trap, I know they will cross breed, I am setting up a 20G for them now)
8 blue pearl shrimp(also have a breeding trap)
16 angelfish babies(moved to the 20G tomorrow)
1 red betta(peaceful)


but

I found my giant amano female(berried) 3" laying dead with 2 other tiger shrimp
The water parms are perfect. I just tested 1 week back, no recent additions, except for blue pearl shrimp added 5 min ago, but I found them dead 3 hours ago

the amano looked like it had just molted as it was pinkish, but the other tigers were also pinkish, what is happening

the other tigers left, yellows, and other shrimp are great

so what happened?

I have been feeding them fluval shrimp food, and algae wafers weekly.

please help, really worried

:help:

doing a 50% WC and I will test parms later.

bump

well, no since this never happens, I have kept and bred yellow shrimp, RCS, fire reds, blue pearls, for a while, I just got some striped neocard. species
http://www.aquabid.com/cgi-bin/auction/closed.cgi?view_closed_item&fwinverts1311883247

i don't think there is copper as none of the other shrimp are dying.

nope, not their molts

just found 2 more dead, and found a blue pearl dead too

pics up soon

really sad, I paid so much for them

View attachment 180670View attachment 180671View attachment 180672View attachment 180673View attachment 180674

please help
:help:

really worried
expensive, $6 each at my LFS, and I got them for $5 each free shipping. Down to 5.