I am not meaning to sound like a smartass here either I just want to explain the difference to you so you can understand, but when you throw the word grade around when speaking of flowerhorns it refers to certain factors that make up a high quality competition line fish.
since it isn't a flowerhorn it doesn't have a grade...
I am not saying your fish is low quality. He looks big, healthy, and beautiful, but it doesn't look like it is a flowerhorn and therefore cannot have a grade.
grade refers to flowerhorns only. What you have is a high quality fish, not a high grade fish.
does that make sense?