A clip on fan or any fan that can push 60+ cfm will cool your water. My water normally gets to about 82 during the high point in the day. With a dual clip on fan my temperature ceiling is 78 degrees. I got mine on Ebay for 16.00. I opted for an unbranded Chinese version or you can pay 30% more and get a name brand like Zoomed or Aquatek. You can also spring for a Walmart clip on fan for 6.00, but those are fairly ugly, but it all depends on your needs.I'm not sure if this is the best section to post, but I'm exploring what pair of fish to add to my 46g planted tank and P. Pulcher seems to fit my requirements - except for one. Do you have any suggestions on keeping my water cooler in the summer without investing in a chiller? The room the tank is in doesn't get much direct sunlight, but I learned last year that it doesn't get as cool the rest of the house. Subsequently, the water gets up to 81/82 during the day from the end of June through August. I have LED lighting (had been using T5) and a glass canopy to keep the jumpers in the tank. I can't raise the lights or move the tank to another place in the house (and still stay married). I probably only need to lower the temps by 4-5 degrees.
Are there any novel solutions that you all have used to lower your water temps? Frozen water bottles? Use a fan to blow over the top of the water by removing part of the canopy? Give up and choose fish that can stand warmer temps?
Search for Cooling "Twin Fan (2 fans) Aquarium Chillers 80L" on Ebay if you want to see what I'm using.
I believe the temperature reduction is mostly due to the fan displacing the heat generated by my lights which would just sit there otherwise.