ok, had a few minutes and found this:
Tiger pistol shrimps belong to the family Alpheidae.
There are over 600 shrimp species in this family and they all have the characteristic "pistol claw." Due to their family name they are commonly referred to as alpheid shrimps.
If you plan on keeping a tiger pistol shrimp in your aquarium you should make sure that you provide it with a goby species that it has a symbiotic relationship with, otherwise your shrimp will fail to thrive in your tank. Tiger pistol shrimps that aren't paired with an appropriate goby species spend most of their time hiding and aren't happy animals. We should never bring animals into captivity unless we are able to provide them with a life that is similar to, or at least close to as good, as what they have in their natural habitat.
You also need to make sure that you use very fine substrate, such as sand or very fine coral rubble, so that your tiger pistol shrimp is able to excavate a burrow. Make sure to also provide lots of live rock for caves.
It isn't necessary to feed your pistol shrimp live prey. In general, they are easy to feed in captivity. They are scavengers and will help to clean up uneaten food in your tank. They need a meaty diet of chopped up seafood (e.g., shrimp, marine fish flesh, squid), frozen aquarium fare for marine fish, sinking pellets (they are bottom feeders), vitamin-enriched brine shrimp, and mysis shrimp.
Tiger pistol shrimp generally sell for about $18 each. Of course you'll also need to purchase an appropriate goby species (Cryptocentrus cinctus, or Stonogobiops or Amblyeleotris spp.) for your shrimp. If a shrimp and goby are already paired at the petstore you should purchase them both.
Like all marine shrimp species, they are intolerant of flucutating water changes and so you must be careful when acclimating them to a new aquarium.
These shrimps molt (shed their exoskeleton) in order to grow. Supplementary iodine sometimes helps with this process.
Also remember that all invertebrates are intolerant of copper in their tanks - so don't use any copper based medications in their tank.
Tiger pistol shrimps typically live for several years if cared for properly.
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So, you really do need to find out which shrimp it is.................some times a pair are sold on ebay, have you had a look?
I would also suggest you ask the question on the saltwater invertibrates section: 'can someone in the usa suggest a place I can buy a hi fin goby and shrimp pair on line or in my area' obviously you will need to say where abouts you are in the States
Seffie x