hi i need help, for some reason my 30 gallon tank is starting to get overly hot. it hit 84 degrees today and the heater hasnt been running and im starting to loos oxygen in the water.right now i have my canister filter sitting in ice water to bring some of the tempature down and i picked my light up off the top of the tank. i currently have a powerhead putting air into the tank now but i still need help with the tempature.