  We consider flux vacua for type IIB orientifold compactifications and study
their interplay with the tadpole-cancellation condition. As a concrete example
we focus on $\mathbb T^6/\mathbb Z_2\times \mathbb Z_2$, for which we find that
solutions to the F-term equations at weak coupling, large complex structure and
large volume require large flux contributions. Such contributions are however
strongly disfavored by the tadpole-cancellation condition. We furthermore find
that solutions which stabilize moduli in this perturbatively-controlled regime
are only a very small fraction of all solutions, and that the space of
solutions is not homogenous but shows characteristic void structures and vacua
concentrated on submanifolds.
