Seems like the shrimp won't do well if the tank water is above 84 degrees. Here's a quote on them from floridadriftwood.com :
" Detailed Description
Popular in planted aquaria, these attractive shrimp can grow up to 2 in length. They are usually approx an inch in length when sold. They are well known for their love of soft, thread-like hair algae.
The Caridina japonica is not a tropical species and should not be kept for extended periods above 84 Degrees F. [Picture] They are very long-lived if their aquarium's water quality is maintained. We've kept a couple for 3 years now and they are still with us though YMMV. They should not be introduced to an aquarium if it is likely to experience Ammonia or Nitrite spikes, so introduce them only to an established aquarium. They will go to great lengths to snatch fish food if their tank mates will let them and they will eat less hair algae if they are well-fed.
If your aquarium is filled with water to the rim, be sure to cover it b/c unlike other shrimp, they will crawl out if given the chance."
" Detailed Description
Popular in planted aquaria, these attractive shrimp can grow up to 2 in length. They are usually approx an inch in length when sold. They are well known for their love of soft, thread-like hair algae.
The Caridina japonica is not a tropical species and should not be kept for extended periods above 84 Degrees F. [Picture] They are very long-lived if their aquarium's water quality is maintained. We've kept a couple for 3 years now and they are still with us though YMMV. They should not be introduced to an aquarium if it is likely to experience Ammonia or Nitrite spikes, so introduce them only to an established aquarium. They will go to great lengths to snatch fish food if their tank mates will let them and they will eat less hair algae if they are well-fed.
If your aquarium is filled with water to the rim, be sure to cover it b/c unlike other shrimp, they will crawl out if given the chance."
