I have a combination of large floor standing fans, desktop clip on fans and these specific aquarium ones:
https://www.ebay.com.au/itm/Aquariu...hash=item2ccfc1fbb3:m:m2vh08z_oqbYkQZyFCZkwxQ
https://www.ebay.com.au/itm/Aquariu...hash=item2ccfc1fbb3:m:m2vh08z_oqbYkQZyFCZkwxQ