I have a 40gal. with 140 watt lights all together. My question is will this dramatically affect the temp. of the water. I have the temp set at 77F and the heater looks like it is not in use, like the water is warmer than 77. What do you think?
the lighting on our tank highly affects our temp. we leave the lid off while we are home with a fan blowing on the water. at night because the lights are off i put the lids on and then do the same thing the next day.
Yes get a thermometer, and yes the lights could have a dramatic effect on the temp depending on the type of lights used, type of hood, and several other factors.
After you get your thermometer you can remove the glas top if you use one and put a little computer cooling fan in your hood. This will cause more evaporation and lower your temp considerably.
I have a thermometer and it says 77 but I have it at the bottom of the glass and not near the top where the light is, but I don't think that will make a difference. Will it?