Thank guys. I already bought NLS thera, Algae Max, Probiotix and some seachem flakes but all failed to feed him. He didn't care, he just looking at it and go away...I asked shop owner and they said that they usually feed him live food ( worm, small fish...). I searched though the forum and a lot of opinions about let him starve but it already 3 days and he still not accept new food. Maybe I will need to find a another way to train him... Now I thinking about let him live with another dry food eater fish, but don't know if it is a good way or just waste time... Live food feeding is not a problem for me but I had bad experiance with feeding continously live food in the past. I will try to searching more on forum.