Yes these sharks are very common in the pet trade. I personally have 2 bamboo sharks and port jacksons (AKA Horn sharks) can be housed in the same tank with them. They require a minumum or 300 gallons though. Where the bamboo shark requires 180.
No, they are not brackish. This shark along with just about every outher species of true sharks are not able to switch from marine.
This shark hatches from an egg just like the bamboo shark but the egg is different. It looks like a big fat black corkscrew. Where the bamboo sharks eggs are much more transparent with more of a flat/ bubble shape. You can even see the young shark developing inside it.