anybody have info on Columbian Sharks

Arius seemani is more widely avaliable.

Brackish water fish, grows to 24". Not a good candidate for a 20 gallon tank

Arius jordani is also brackish and grows to around 10". Should be kept in at least a 75 gallon aquarium.
 
You can also search under "silver tip sharks" for a few past entries. You have to be registered as a board member, then at the top portion of the site, there is a "search option".
 
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