i dont think the temperature or high salinity killed the fish !
cuz i have had a 29g bio cube too , my salinity been up to 1.030 and ( 84F ) my fish and coral were always fine
when my water temp went high i put Ice in my the back of my tank lol it worked
and check ur PH sometime it could drop fast to low and kill ur fish and coral
and i put fish coral in my 2 days old RSM250 all the fish and coral are fine
if you need help let me know im by surrey central
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