I keep my tanks at around 78-82 u may need a new heater it is best to run a few smaller ones so if one fails u wont have any heat. As for ph 7.5 is low i see you do not have a skimmer a skimmer will help pull oxygen into tank bringing ph up. Try more surface agitation. Run cheat o in the sump on reverse lighting as display will help.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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