I've kept mine with the following, without any unusual deaths,
Mollies, guppies, Mystery snails, MTS, Ramshorn snails, RCS, Bamboo shrimp, Macrobrachium kulsiense, Cherax quadricarinatus (with pleennnty of room, I don't recommend this), Ghost shrimp, and Amano shrimp.
Make sure that there is plenty of food, and that your Red Claw population does not over grow, causing fighting between adult males.
Mollies, guppies, Mystery snails, MTS, Ramshorn snails, RCS, Bamboo shrimp, Macrobrachium kulsiense, Cherax quadricarinatus (with pleennnty of room, I don't recommend this), Ghost shrimp, and Amano shrimp.
Make sure that there is plenty of food, and that your Red Claw population does not over grow, causing fighting between adult males.