  We study, in a holographic setup, the effect of adding localized fermionic
impurities to the three-dimensional Chern-Simons-matter theories with
unquenched fields in the fundamental representation of the gauge group. The
impurities are introduced as probe D6-branes extending along the radial
direction and wrapping a five-dimensional submanifold inside a squashed CP^3.
We analyze the straight flux tube embeddings and study the corresponding
fluctuation modes of the D6-branes. The conformal dimensions of the operators
dual to such fluctuations depend non-trivially on the ratio of the flavor
number to the Chern-Simon level of the unquenched ABJM.
