That is an awesome frog! I think that in the coming years, one of those will be my next frog purchase.
I avoid feeding my (horned) frog fish and mice, because fish tend to carry parasites, and mice are very fatty. I feed nightcrawler worms custed with vitamin/calcium powder, and this is keeping my frog healthy. I only use the powder about every-other feeding, though (she eats only a few times a month, because she spends much time buried, but you may want to use the powder less often since your frog probably eats more often.)

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2.1 Ball pythons: Goblin, Ashes, and Bela
1.0 Boa Constrictor Imperator: Apache Fog
0.1 albino Cranwell's horned frog: Bene
1.0 Tiger salamander: Slasher
1.0 black kittycat, Inky
A bunch of Oscar cichlids, one giant pleco, huge breeding lot of "fancy" (read: deformed) goldfish, and me an' the boyfriend.