water temp & mh lighting

[adidas]

Originally Posted by Saltysteve

I love my 15$ Coralife digital thermometer. Probe can be placed anywhere in the tank. Mine is low and to the opposite side of the heater.

Me too, it's great.

When my MH's are on during the day, by the time they go off the water is at 84F. I need to get a proper canopy and fans.

[Chin_Lee]

should be considered in two places
1) for your canopy to dissipate the immediate heated air around the halide bulbs and removal of the heated air out of your canopy away from your water

2) fan aimed at the water because the process of evaporation uses up a lot of energy (consumption of energy required to bring a liquid to a higher state [in this case vapor] is significantly higher). as more water is evaporated, it consumes more heat (energy) which brings the water temp down. I have a small 4" fan that maintained my 250 gallon system at 81 F over the summer. this was before I installed the MHs but nevertheless, it was at least 88-90F for many days in the summer and my tank kept its cool around 81.

hth
cwlee

[Willow]

i have 2 digitals, 1 glass and 1 controller and they all give me a diffrent reading.