How many sharks for a 500g pond?

[watcher]

How do you mix bamboo sharks? Do you have to get a female and a male or can you just buy 2 sharks?
Also can you mix butterfly fish with sharks?

 

[jim27]

It doesn't really matter how you mix them, although you'll want at least one of each --- if your planning on breeding them.(obviously)
Also I've read that butterfly fish are known to pick at sharks so they wouldn't make a good tank mate.