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Just for information here is what I found on a site that sells Halocaridina rubra. Obviously, they aren't for a standard SW reef tank.
"These shrimp are endemic to Hawaii where they inhabit underground lava tubes where rain water mixes with the ocean water into open anchailne ponds creating a very unique environmnet with low sailinity (16 ppt) and varying temperatures (65F to 75F). Here they feed at night on the bacteria and fungus that grows on the lava walls and rock crevices that are exposed to light during the day.
Ocean Rider aquafarms these shrimp in our own anchialine pond. At home you can house up to 100 shrimp in 5 gallon tank with a sponge filter, very little light, gravel substrate, and sea lettuce for habitat. You can feed them small amounts of Shrimpgro, being careful not to overfeed. Or you can cultivate your own fungus and bacteria on the tank walls and floor for them to graze on. Be sure you use a hydrometer to check the specific gravity which should be 1.0114. Water temperature can range from 60F – 75F, Ammonia and Nitrites must be kept at 0, Nitrates should be less then 10ppm PH 8.2 – 8.4"
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