They should be fine up to 30 deg C, it’s a shame you can’t take the lid off because of insects, maybe you could buy a large fabric screen or mesh to put over the top.. this would let the tank cool a little and keep the bugs out.
If you feel the water is getting too hot keep some bottles of frozen water in your freezer and just pop the whole thing in your tank and it will cool it down (bottle and water and cap secured, not pour it in :p ) it will act like an iceberg floating in the tank lol.
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