I am thinking to give it a try, but I know nothing about them. I gather flashers are something to attract pelagic fish? When do we need them, how useful they are, what kind works better etc. Any snippets of knowledge will be highly appreciated. Will it work for barracuda? How about tuna? I am packing for Thailand, should I buy flashers (again, which ones?), or can I rig something from tin foil or tin cans while there?