The snakehead is from the family Channidae, and is found from Africa
to China. Different regions use them differently, from pets to food to
medicines.

All snakeheads are carnivores, and are best fed frozen fish or live
foods such as ghost shrimps and feeders (though i dont encourage using
feeders). Minimum tank for a dwarf snakehead would be a 20g, though i
really recommend keeping them in nothing less then a 30g. Water
conditions such as pH, temperatures, and hardness are not fussed about
and anything avoiding extremes will do.

Note that these guys are illegal in many states in the US and the
whole of Australia.

Now for a few of the more common species:

1) Channa micropeltes, red snakehead aka giant snakehad - One fish
which is only for the truly dedicated and prepared! Growing to a
massive 3 feet, these guys are fully capable of biting your hand off,
and will! One fish which definitely shouldn't be in the hobby.

2) Channa striata, chevron snakehead - A relatively large snakehead,
it gets to about 1 1/2 feet, and needs a large tank, at least 4'. It
is almost impossible to get tankmates for it, will kill most other
fishes, though plecos and other docile, low-profile bottom dwellers
may work out.

3) Channa bleheri, rainbow snakehead - One of the dwarf snakeheads,
this fish is easily kept in the home aquarium as it gets to 8", which
is small for a channa. Minimum tank size is 20g. Feeding is simple as
they will take most meaty foods, from bloodworms, to shrimps, and of
course, fish. Beware though, they need tight fitting hoods as they are
powerful jumpers and can easily jump out of a tank. Suitable tankmates
are fishes that are at least half their size, and bichirs are suited
to this. Care is similar for channa gachua and channa orientalis

4) Channa marulius, cobra snakehead - Another unkeepable fish, this
fish grows larger then even the micropeltes! It gets to almost 4' in
length, even larger in the wild. It won't rip your hand off like its
more aggressive cousin, but it certainly isnt a little puppy dog. If
you ever plan to keep this fish, get a pond!

Update VIP:
They are illegal in all fifty states in teh US fairly recent federal law.

very hard 2 find in canada. i think i seen 5 babies for 25 bux a piece and way gonna get a couple but then i thought naw i dont want those suckers getting big and running away from me LOL

one problem snake heads can and will climb out your pond and run away if u ever get these guys keep them indoors for the native spieces please. ill get u the links when i can find em

They will most likely not "run away" unless the water parameters are very bad. They won't just up and leave for no reason. You do need to be careful with them in tanks because they are infamous for finding any hole in your top and jumping out.

i want to get 3-4 dwarf snake heads

I beleive that only a few members of the chana family are capable of running away? just a thought.

Where ya from fish man? i have some chana bleheri (dwarf rainbow snakeheads) that need a home