Yes especially nems of the same species. All BTA's should be able to be kept together with relative ease. What are you tank specs/ inhabitants / how long was the original in and how long did you wait to add another?
The original one may just be a bit stressed due to the new addition. Pictures?
It depends. Some are unaffected while others will get stung.
I would recommend to keep an eye on the shriveled one, if it stays like that for a few days, I would recommend you move it away from the other one to a different spot as it could potentially die if it gets stung for a prolonged period of time. If you can't move it, try placing some sort of barrier between the 2. Chances are one will move sooner or later.
I have had cases where bta 'A' would get along with bta 'B', but not with 'C', however 'C' and 'B' were fine.
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