Sure we should.
But first, anybody must decide if he/she wants to introduce some crustaceans:
- as a longterme population, cleaning the tank, and occasionally feeding caudates ?
- or as a regular and substantial part of the food ?
The first option necessitates a very complex st-up (plants, rocks, crevices, wood, dead leaves...) so that a significant part of the crustacean population can avoid to be eaten.
The second option necessitates a real separate culture, or a rich pond or stream not too far ?
I founf Asellus easier to maintain, because they don't move a lot, and the caudates don't see them immediately. Gammarus are generally totally eaten within a few days or hours by big caudates (axolotls).