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agree with R0B, ultimately a chiller makes more sense if you want to maintain temp at 28 degrees and below. if it hits 31 degrees sometimes I really doubt it’d be able to lower the overally water temp to 28 before the fans go bust hahaha. not to mention your tank is also pretty tall so it might take an even longer time to bring the temperature down. you could try going for a secondhand HS-66A hailea chiller. perfect for a tank of your volume imo. cheers Sent from Singapore Reef Club mobile app

Short answer... you would need 6-8 high powered computer fans running 24 hours to impact the water temp for a system of your size. However, a chiller is really your best bet. Long answer (with a bit of science and math)... the specific heat coefficient of salt water is 3,992 per litre per degree. Your tank and sump is approximately 580litres. So to decrease your tank temperature by 2 degrees you would need 3992x580x2 = 4,631kJ of energy. Now a good chiller would have a coefficient of performance (COP) of about 4, whilst a large 50w 18 inch fan with evaporation effect has approximately a COP of 1.33 (or so I can deduce from the interweb) depending on blade angle and RPM and surface area covered. So let's assume you have this 18 inch fan you would need 4,631kj/1.33 = 3,488kj to decrease the temp of your water by 2 degrees. Now assuming, you are NOT adding any heat back into the water (so all lights, pumps, skimmers and no wavemakers are switched on) and given that 1 watt is 1j/second, you would need to run your 18 inch fan for 3,488,000/50w =69,776 seconds or 19.38hours to decrease the water temp by 2degrees. However, you will need to run lights, pumps and skimmers and wavemakers. Assuming this doubles the cooling requirements (which is probably an under estimate given ambient temp and your 30+ degree tank) you are going to need to run approximately a total of 30inches of fan blade across your DT and Sump for 24 hours to keep the water 2 degrees cooler. So depending on fan size that can be 6 (140mm) or 8 (120mm) high velocity computer fans running 24/7 (plus a rather large ATO and a dehumidifier). The point is, fans are good for small systems to bring the temp down a little, they are cheap and effective. However for larger systems you need a chiller which is actually more cost effective in the long run. Hope that helps Sent from Singapore Reef Club mobile app

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Lol I never test my parameters for years already