Flower horn not eating since change of food

Ashish asked 3 months ago

I have a flowerhorn fish which is 10 to 1months old and its very active and it has got beautiful head and colour.
I was feeding him more Pro bio which he liked a lot and everything was fine until then the food was finished so today I got a new food are called inch gold which costed me 650 for the big one and now my Flowerhorn Fish is not liking it it’s puking out what he is having it so what to do
Please help me with this.