first off the 29 gallon is too small, take it from me, I had a copper.
All of them are different when it comes to feeding. The second I put him in the water, he started eating, he devoured all the tube worms in the tank and never touched the aiptasia(which was plentyful)
when I saw that he had eradicated the
tube worm populus, I started him on a diet of dry pellets and brine shrimp which I fed to him once a day. He did fine for two weeks and w/o warning, was floating upside down one morning...that was that. They need near perfect water conditions and even though they eat, can starve to death.
I would suggest a long nose butterfly cause theyre way hardier.