JG wrote in message
om...
I have a new 125 gallon tank that I'm just getting set up and it's
running a little hotter than I'd like - 81F
I'd like the temp to be about 77F, so I only need to cool down 4
degrees.
I have a clip-on fan blowing on the sump, and two 3" Radio Shack fans
blowing on the lights.

I thought about buying a piece of titanium tubing (can buy a 3' length
for $40 or so) and bending it into a coil.
Then pump water through it and blow a fan across the coil.

Would this have any affect, or is the coil too small?

The other thing I haven't tried yet, is replacing the solid glass
cover on the top of the tank (that the lights sit on) with eggcrate.
The eggcrate will allow for more evaporation, but now the water is
more directly exposed to the heat from the lights so I don't know if
that will make it better or worse.

Jeff

If the tank is set up in an place without air-conditioning, the water will
rise and fall with the room temperature. As a new aquarium, the extra heat
above what you are aiming for will promote quicker plant growth, and faster
cycling. That 4ºF isn't much of a spread.
A fan blowing on a coil won't do much for that volume of water. The
powerhead in the tank will add more heat. Eggcrate will allow better
evaporation and cooling, but means more water for top-ups. I have no heat
problems with my fluorescent lights and wonder what types of lighting you
use.
Personally, I wouldn't worry about it for now. Summer's half gone so the
ambient temperature should come down a bit, unless you are in an extreme and
constant weather area.

Jim