  We investigate the low-lying spectrum of closed confining flux-tubes that
wind around a spatial torus in D=2+1 and carry flux in different
representations of SU(N). We focus on our most recent calculations for N=6 and
{\beta}=171, where the calculated low-energy physics is very close to the
continuum and large-N limits. We investigate the adjoint, 84, 120, k = 2A, 2S
and k = 3A, 3M, 3S representations and show that the corresponding flux-tubes
do exist. Similarly to the results for the fundamental representation, the
ground state of a flux-tube with momentum along its axis appears to be well
described by Nambu-Goto all the way down to very short tubes. In contrast,
excited states have much larger deviations from Nambu-Goto. We discuss whether
these states are non-string-like and associated with excitations of massive
flux-tube modes.
