Very interesting! This is why I like the forums.
I've noticed a few of my Haddoni's getting upset and deflating or uprooting. It's always been with Gig, Mag, Sebae. There were no LTA or BTA in the tank.
It really sucks because I love the look of a Haddoni. I'm afraid they may be too sensitive with multiple other species long term. Plus, I think that Haddoni have a very strong odor in the tank that other nems dislike. Either that or it's Allelopathy.
Either way, I'm probably gonna try one more time with just one haddoni. If it happens again, I'm done. They will go in species only after that.
Minh has Gig, Haddoni, Mag, Malu currently all together in a 320/G. I believe that water volume does indeed play a role. Who knows though.?.