how to keep water temp down????

[aaronbaker1]

i have a 46 galon tank with ten gallon sump. i do not have a heater hooked up in my tank and my temperature still stays at 80 or 82. i would like it to be around 76. my mh is about a foot and a half away from the tank so i don't think that it would be heating the water that bad. what can i do?

[Gwynhidwy]

A chiller or a fan blowing across the water would likely work.

[LobsterOfJustice]

fans...

[macronut]

I have 2 250W10k's and 2 110W vho's on my 90 mounted 10 inches above the water. 2 fans running. No heat build up. A good fan should do the job.

[BLKTANG]

80-82 is ok if it stays there constantly.My reef is always 81.5-82

[seapug]

+1 on fans blowing across the surface. It'll give you a 3-5 degree drop in an hour or so.

[bsagecko]

80-82 is fine with just one small fan blowing over my lighting i can drop the temp 6 degrees so i recommend fans

[downhillbiker]

i have a 760w metal halide 6" off the water and just have 2 fans from wal mart for $5 each that blow across during the summer. my tank fluctuates from 79.9 to 80.1 from night to day. makes evaporation rate a lot faster though and warms the house a little. i also live in oregon so the climate is fairly cool.

[scbauer]

2 parts to the fan thing... I used to keep a fan blowing up across my MH pendant to blow the heat from the light away from the water surface. I also kept a fan blowing on the surface of my sump which really helped, but also really increased my evaporation, requiring more top-off's.

[downhillbiker]

more top offs may be a good thing. if you have the time to do it this gives you more opportunity to change parameters in your tank, such as adding kalk, so i'm told.

[aaronbaker1]

thanks everyone for the advice. i appreciate it very much.

[vanmo92]

Fans, Make sure you leave vent holes in the canopy it applicable. Fans across the sump is also a good way to do because then they are out of the way (and out of sight) and they will be fairly easy to mount under your stand.

[pledosophy]

I use exhaust fans in the canopy to remove heat build up from the light, and a 6" fan cliped to my sump pointing at the waters surface, it actually makes a ripple in the water.

I keep my heater set to 72F, it's on a lot.

[frags75]

just wondering if you get that much heat from your lights? 18" above the surface is pretty high IMO and maybe its coming from somewhere else, like a bad pump or something else that creating heat or electricity.