What are acceptable temperature swings? My tank this a.m. was 77.2, by this afternoon 78.6, my lights came on about 5 hours about and it's 80.2. It's a stock Aquapod 24 that I just set up 2 days ago. I don't have anything in it except for 2" aragonite sand that I seeded with 2 cups of sand from an established tank.