Alright then.
I had previously stuck a humidity sensor in the horizontal nest and did some datalogging over 24 hours. The humidity hovered around 90 to 97% at the wet area so unless you are using your own rendition of a humidity scale, I'm quite sure it is acceptable to conclude that this particular species prefers high levels of humidity since they did not move away to a drier part.
So, these water-loving ants preferred a dry-ish test tube over the formicarium.
Likewise, I can apply your logic and flip the question over to you. Isn't it somewhat paradoxical that you claim that the formicarium was dry, forcing your wet-loving ants to move to a more "dry-ish" test tube which is somehow more humid than a saturated wet sponge? Unless you are telling me that the formicarium magically caused water to cease evaporating in a small confined space, resulting in said space being dry.
Also, how would you know if your wet-loving ants are really wet-loving and moved because of humidity issues? You yourself said it was impossible to define what exactly is wet-loving since you insist that staying near areas with high levels of humidity does not equate to wet-loving.
Edited by Etherwulf, July 4 2015 - 9:43 PM.