I have had a Flame Hawk, and found it to be one of the nicest additions to my tank I ever had. As far as I observed it was in no way a jumper. Due to its lack of swim bladder it can hardly swim, let alone jump. They are naturally predatory on shrimp. If it will fit into its mouth it will likely consume it. It has been stated that they are OK with shrimp that are large.
You should have plenty of room in your 75 that contains only six fish. I had mine in a 10 gallon tank for awhile. I am very sorry I took mine back to the LFS. It was in my early reefkeeping days when I wanted some shrimp. To this day I am still kicking my behind. If I ever see one at a reasonable price I will get it.