temp monitor for lights

[Diomedes]

Another idea might be to mount a fan that blows across the surface of your water (gently) and connect that and a heater to a dual-stage Medusa temperature controller (available at J&L's) it is super effective on the 2 systems I have it installed on...When the temp rises the fan turns on, when it goes below the set point, the fan is off and the heater is turned on...It is keeping one of my 150 gallon w/1122 watts of MH/Fl light from 76-78 bang on...very imressed.

Good luck
Stephen