The old man

During the plant fest I bought three "red neon gobies" from HAW. So far they have not touched the bba even when dosed with excell and dying. Yesterday I saw one catch a nice sized red shrimp and devoured it slowly. I really think the ones I got are not algae eaters. Anyone else had this experience? They also do not show much color at all with only a little tinge of orange in the tail. They seem quite active now, but only going after fish food and shrimp.