External pumps really add that much heat?

[Tom R]

Originally Posted by banditpowdercoat

the 150g has
Dolphin AmpMaster 3000 external
Little Giant 4 Mqdx external
maxi-jet 400 and 900 on skimmer, internal
2 150W pendants
1 250W pendants

Neither of the External Pumps that you are using are known for increasing the heat within the tank. They may add heat to the room however it shouldn't be enough to increase the water temp.

The increase in the water temp is probably a result of the Lighting.

It is very difficult to reduce the amount of evaporation and still have a healthy tank.

It will probably be much easier to control the evaporation with water top off and ventilation.

Tom R