The first time I offered Charlie a guppy he showed no interest......in fact, he was intimidated by it! My daughter works at the LFS and said there was a blue damsel in with Charlie at the store, and he could never catch it.....thus he just gave up......he's only 3 inches long and I think the damsel was too big and he lost his confidence. Once he found he COULD catch and eat a guppy he regained his condidence. I offered him a guppy for the second time today and he immediately started luring and got all excited. Took him about 30 seconds to snag him
If your angler is full grown I would think a small chromis or blue damsel would not be too much of a challenge. Just be sure they have gone through quarantine as not to give you guy some unwanted disease......just thought I'd share my expereince.....
Janey