We thank D. Schar for loan of the Aqualogic Chiller and tank. J. Dulin provided assistance with PVC base preparation. H. Putnam, J. Davidson, R. Ritson-Williams and B. Lenz provided help and practical advice at various stages of the experiment. Funding was provided to R.A.B.M. by a Fulbright Scholarship (Australian-American Fulbright Commission), Joyce W. Vickery Scientific Research Grant (Linnean Society of New South Wales) and Paul C. Silva Student Grant (International Phycological Society). Coral collection was performed under the State of Hawaii Division of Aquatic Resources permit number SAP 2015-8.