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what crayfish could i put in a empty ten gallon, also how many

also cloud i put any cray fish in a 30 with 15 tigerbarbs and nothing else

The typical crayfish that you can buy are canabalistic, and will kill any other crays.

Also, tiger barbs might not be a problem since they are so fast/active, but crayfish will prey on fish if they get the chance, however I do have loaches in with my electric blue, and they're doing fine, so I would say TB's would be fine.

crayfish, will usually eat, and catch fishes, so i wouldn't mix it. the common red/louisiana cray fish is a good choise. very common and low matience. the blue color is also avalible, but often evpensive.

Crays are neat to have, but not community friendly, and will often be agressive with one another, so it's also hard to keep more than on ein the same tank. A ten gallon tank is also only really big enough for one cray. Barbs may be fast enough to avoid becoming a meal for the cray, and honestly, they are cheap and plentiful enough in pet stores to warrant the experiment. Six barbs and one crayfish would be more than a fully stocked tank, though, so keep up your maitenance.
Crays are well known escape artists, and they are strong enough to actually lift the lid on most aquariums, so make sure there are no holes big enough for them to get a claw into (which includes filter intakes) and if your light is not heavy, use a book or a rock or something to add weight to your hood. Crays will also sometimes dig in the substrate, so live plants don't always work. Make sure you provide a large cave for the cray to hide out in during the day (they are mostly nocturnal) and add a few drops of marine iodine with every water change.
Feeding the cray may be challenging if it isn't eating your fish. It will need a varied diet that includes foods high in caclium with which to build its shell. You may want to try frozen krill or fully grown brine shrimp, and perhaps a hermit crab pellet food and sinking fish pellets (like for cory cats). Crays are scavengers and should have no problem finding food on the bottom of the tank, but you'll want to watch it carefully for the first few weeks to determine what its habbits are and what it likes and doesn't like for food. You'll also probably have to do extra vacuming for those first few weeks until you get a feeding schedule that's just right.

Hoping that there must be a word for everything I mean...