  We investigate the nature of the quantum Hall liquid in a half-filled second
Landau level ($n=1$) as a function of band mass anisotropy using numerical
exact diagonalization (ED) and density matrix renormalization group (DMRG)
methods. We find increasing the mass anisotropy induces a quantum phase
transition from the Moore-Read state to a charge density wave state. By
analyzing the energy spectrum, guiding center structure factors and by adding
weak pinning potentials, we show that this charge density wave is a
uni-directional quantum Hall stripe, which has a periodicity of a few magnetic
lengths and survives in the thermodynamic limit. We find smooth profiles for
the guiding center occupation function that reveal the strong coupling nature
of the array of chiral Luttinger liquids residing at the stripe edges.
