I think it's wise to cut back on your lighting on hot days. Also, when I come home from work I check the temp and if it's 86, i'll take a ziplock baggy filled with ice cubes and put it on the water surface. I usually need 2 baggies. This usually brings the temp down nice and slow, so it's not a big sudden change.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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