I've run in to the same issue. I actually keep my house at 68F but for some reason my tank likes to creep up to about 74F (probably because I use a glass lid and my tank receives a good amount of indirect sunlight). How large is your tank? A larger tank is usually easier to stabilize vs a smaller one. I myself have a 40B and it usually holds temps fairly well but obviously a 125 gallon would be much harder to shift in temperatures and a 10g will swing wildly in temps (which is why small tanks are pretty worthless).
Here are somethings you can try, some of them would work best in combination with each other:
1. Get a large fan, I use a box fan, to blow air on the tank. I you have a nylon mesh lid and a fan blowing air on the surface of the water that could easily lower the temperature by a few degrees. (This is what I do and it has my tank down to 70F). if you combine this with the nylon mesh lid and can get the fan to blow across the water surface this drastically reduces temperature as it promotes heat to escape (also increases evaporation, so you will need to replace the water more frequently as it exchanges to gas).
2. If you use a glass lid, try a nylon mesh screen top instead (this would probably have to be a Do It Yourself project). You just want to make sure the lid is secure because ACF can and will jump out of their tanks, I know this first hand!
3. Do more frequent water changes, swapping out the warmer water with cooler water. Same as weekly water changes, just more frequent. The bonus to this is, the more water changes the healthier your frog(s) will be.
4. If you use a canister filter, you could place it in a bucket of ice, that would cool the tank as the water runs through the canister and back in to the aquarium.
5. You could fill a 2litre soda bottle with water and freeze it and then place it in the tank.
6. Is your tank getting indirect sunlight? Move it to somewhere that receives little to no light from a window, indirect sunlight incases temps.
7. Purchase an aquarium chiller, but these are very expensive and usually for saltwater tanks..$$$.
8. An air pump may help, but honestly I would not use these with clawed frogs because it may saturate the water with oxygen and cause gas bubble disease (at least in theory..).
9. I'm not sure what your A/C situation is but if you have central AC, lower the temperatures a bit. If you do not, place the tank in a room with a window AC unit or put a window AC unit in the room with your tank to lower the rooms temperature.
Here is my, albiet ghetto, summer time setup. Since I have a glass lid, I just placed a cheapo box fan in front of my tank to cool it. It's crude, but it works. I also have my glass lid cracked enough to allow air in from the fan but not allow the frogs to escape so that some heat can escape.
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