today for some reason my 75 gal tanks temp kept rising it went all the way up to 85.5 and i turned down my heater to 75....i have about 250-260 watts of lights going so i just turned them off and it went down to 85.1 then 10 mins later went back up to 85.2 i dont get whats going on im new to saltwater just got this tank about 2 weeks ago but took the cycled water when i bought the tank off of a friend. any suggestings?