Squid is always the first food I feed any fish and it works almost every single time. Just cut a few 1/2 x 1 inch strips to start with and see how he goes. I get fresh squid from the seafood counter at the supermarket. Also live shrimp is a probably the best food to get a feeding response
Not usually one to police stuff, but that 125 is going to be too small in the long run. I have 180 and would hesitate to put one in. That's why I changed my mind on making the 180 a shark and ray tank. I just wouldn't have the room. Maybe one day I will have a 340...