1 crappie? Well first off most folks would tell you NOT to put crappie in a pond that small! So it would be good for 1 crappie!
I am sure they would eat the fat heads and or the smaller Golden's, but the larger GSH a crappie would not eat I don't think unless this crappie was like 4 lbs.
Then you ask how to make this a trophy crappie pond? I'm confused as to what you want to do? I thought you were making a GSH pond?
If you wanted to make that small of a pond a trophy crappie pond I would say put about 20 crappie in it ALL the same sex!! If you can get that done. Other wise it just wont work for very long. In 3 years you would be overran with 5 inch crappie. Thats just M.O.
RC
