https://www.practicalfishkeeping.co.uk/ ... keep-them/In the wild, Weather loaches live within a surprisingly large temperature range, dependent on location. In the aquarium they should be kept at a steady sub-tropical temperature within 15-25°C/59-77°F. They have been known to tolerate lower and higher extremes, but are most comfortable within this range.
https://www.loaches.com/species-index/w ... licaudatus10 - 25ºC
While this obviously isn't as warm as needed for, say, discus, it nonetheless overlaps with many other tropicals (eg: with a great many of tropical loaches). So unless I'm missing something, I see no reason why weather loaches shouldn't be kept in tropical tanks that fit the above temperature ranges.