Condy nem turning green?

[DracoKat]

I got a (Free) condy nem from Petco about.. 5 months ago, give or take. It was small and tan/brown.

Over the last 2 weeks, I've noticed the color's turning green.
Last 3 days, it'll shrink to nothing, then expand again.. this is new behavior to me.

Can someone tell me what's going on with my nem? Both color change and shrinking.

All parameters is good (had an alk drop out over a month ago, stable since then)

 

[Mr. Bill]

Shrinking and expanding is normal behavior- all nems do it to expel waste and exchange water. I'm sure it's been doing it all along, you just didn't see it until now. As for the color change, it could be a response to a change in lighting. As long as it appears healthy when inflated and doesn't bleach, I wouldn't worry.