Bi3+-doped　iron　garnet　crystals　(Bi:RIG)　have　received　extensive　attention　for　their　excellent　magneto-optical　properties.　The　quality　of　garnet　crystals　has　a　great　relationship　with　mismatch　in　the　lattice　and　thermal　expansion　between　crystals　and　seeds.　Compared　with　TGG　seeds,　Sc,Ga:YIG　is　more　suitable　as　the　seed　for　growing　Bi:(HoEu)IG　crystals.　The　crystal　quality　and　match　in　the　lattice　and　thermal　expansion　have　been　discussed.　The　as-grown　Bi:(HoEu)IG　crystal　has　a　specific　Faraday　rotation　angle　of　-467　degrees　cm-1　and　shows　a　strong　magneto-optical　effect.