Enzymatic activities were analyzed in 6 colonies for the heat stress experiment, and in 4 colonies for the venetoclax and control experiments. For control treatments, coral nubbins were treated with 0.05% colchicine and 12.5 μM rapamycin for 6h at ambient temperature, then moved to fresh saltwater and sampled at 48h. Corals were cut to ~ 1cm long pieces and frozen at -80°C.