Large Male BD is around 16-17", the others are all between 11-13"...they have on many times tried to eat my large 9-10" SD's! SD's being as fast as they are and flat managed to get away most of the time!...but a 7" won't have a chance! LOL
Wow I didn't relize your male BD was that large. Your other rays are fine with it just that large BD. Good luck with the sale and with you finding one chen.