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What kind of fish do you have? please don't tell me its an arowana because those guys can potentially break tank lids or whatever you're using as a lid.
Its going to be hard to lower the temperature without keeping the lid off. you need to increase water agitation. Therefore, you need to aim your filters/powerheads/etc. upwards towards the water's surface to make ripples. Also, get a small fan or something and aim it at the water surface too.
You can also freeze bottles of water and put them in the tank but its a hassle to maintain because you have to keep replacing them as they warm up too.
Its going to be hard to lower the temperature without keeping the lid off. you need to increase water agitation. Therefore, you need to aim your filters/powerheads/etc. upwards towards the water's surface to make ripples. Also, get a small fan or something and aim it at the water surface too.
You can also freeze bottles of water and put them in the tank but its a hassle to maintain because you have to keep replacing them as they warm up too.