I have 40 gal breeder with 2 200W Aqueon heaters and they have been in the tank for a week and my temps are still at 69 degrees F. I see them turn on and off through out the day. Do I need better heaters? or are they maybe malfunctioning? what do you recommend for a 40 gal breeder. I dont know if this matters but i have a tidal 55 HOB, 2 Aqueon 500 gph pumps and live rock.