Yeah it maybe low Iodine, but im thinking not. Its only a 20g, and I do regular water changes, so i should be able to maintain iodine levels with that alone. I also dose with B-Ionic.
There is only a clown and a damsel for fish in the tank, so I wouldn't think they were the culprit. The other shrimp is still alive and seems to be doing just fine. Im thinking they may have been fighting with each other, and clipped each others antenna and then one died from stress or something...oh well, no biggie.
my water parameters are all fine, I pay meticulous attention to that, being that it is such a small tank for a reef.
Thanks for all the replies!!