Experience with Harvestfish?

Does anyone have any experience with Harvestfish in an aquarium? A few days ago I caught three harvestfish (specifically for the aquarium) and aclimated them to our 75 gallon aquarium. They look great! Very healthy looking, not stressed, cruising around, etc but I can't get them to eat. They are in the aquarium with a panther grouper, orbiculate batfish and 3 pompano. Everyone else eats well. Primary food of choice is shrimp, both live and chopped. However, I have also tried live brine, as well as commercial frozen stuff such as plankton, invertibrate mix and formula one. Interestingly no one is interested in the commercial stuff. Does anyone have any thoughts or experience? I may try some fresh chopped bloodworm and see if that works but I am running out of realistic ideas.
The water quality is good and we spent a full day in aclimating the fish. They look good in the aquarium, they're just not eating. I'd appreciate any help!
Thanks,
Drew1

I'm going to try guppies this evening. Thanks

Guppies didn't work, but two of the three have started eating in the past three days. Thay are eating both dead shrimp (small pieces) and live brine. The third one hasn't started eating yet, but still looks great. Hopefully with the other two eating it is just a matter of time.