We propose to study the temperature dependence of the size and shape of the magnetic domains believed to exist in CaFe2O4 - a frustrated triangular antiferromagnet. Our diffuse scattering measurements on MACS has observed strong diffuse scattering and has been suggestive of a magnetic signal near Q=0. The domains result form the competition between two magnetic structures which (because of the triangular geometry) have little energy difference between the two. We propose to use single crystals to search and study these magnetic domains as a function of temperature.