Three nubbins of each colony were placed into 24 indoor tanks (44.8 l) containing pumps for circulation (2630 to 3000 l/h) on day 1 of the 65 day experiment (20 November 2014-23 January 2015). Twelve tanks received ~444ppm µatm pCO2 seawater and twelve tanks received ~882ppm µatm pCO2 seawater (Table 1). In each of these treatments, 6 tanks received 300 µmol.m-2.s-1 peak irradiance and 6 tanks received 650 µmol.m-2.s-1 peak irradiance (Sol LED lamps, Aqua Illuminations). The photoperiod (12hr:12hr, light:dark) had a 5am sunrise, 5 hour of linear increase in light intensity, stable peak irradiance from 10am to 12pm, 5 hours of linear decrease in light intensity, and sunset at 5pm. Corals were maintained at 25.2? for 57 days of the experiment, and for the final 8 days, each CO2-light combination was split into 3 tanks kept at 25.2℃ and 3 tanks raised to 29±1℃ (Pro 250 Watt heaters, Aqueon). The seawater supplied to both indoor and outdoor tanks was pumped directly from Kaneohe Bay and unfiltered.