What is the difference between Black and Blue Arowanas? I want one for my 180 that my Tig is in. I have read that Blues may be from a different location than reg. blacks but are the same fish?? My LFS can order a 7" "Blue" for $200 or I can buy a 10" "Black" for $200 plus Fedex. Does anyone here have the lowdown on Blue Arowanas and could educate me? net searches produced very little info.