Good luck and do share your solution once you have it :)

I have 240l with Axolotls and set of fans was doing barely anything. I got a special water cooler that stands between filter and the tank. Loud as hell so not an option for a bedroom, 400 EUR, but keeps the little rascals below 19 degrees C even in the top of summer heats.

There are various sizes available, so for smaller tanks some cheaper option would be available

I shit you not, small corpo I work at actually set up an internal e-shop where employees can buy merch. And somehow no employees were reported dying of laughter and there were even a few positive emoji reactions on slack.

What the actual f**** Those tech bros are getting just absurdly evil