Bro if you suspect the absence of a chiller is killing your corals... why not do something about it? It will do your pocket and nature a lot more good to have a proper setup where corals will thrive... for example say within the next 3 months... you buy 20 pieces of $30 corals... that's already $600... down the rubbish chute... I hope I am not sounding too negative here... do let me know if you wanna discuss this further