The price sounds Hydrolycus Scomberoides - very difficult fish to keep for any real length of time, actually most aren't - most have had more success long term w/ Aramatus and Tatauia if it's either of these 2 it's a bargin - Scomb's if it's worth $40 to you. I'm not sure what the going price is for Rhaphiodon's but $40 sounds reasonable to me for Biara's.