Are these 'crabs' destroying my bird's nest?

[gobytron]

those look pretty specialized.

They look so much like the birdsnest.

I would be surprised if they did more damage than an acro crab.

Usually if an organism depends on another so much that their bio chemistry is specifically adapted to it it's unlikely that it will do morethan minimal damage to it's host.

Something to consider, as thats a really neat looking symbiosis and not one a lot of people can brag about.

how long have you had them and have you noticed any adverse effects of their being there?