Rainbow bubble tip?

I bought this nem around a month ago and when i got it it was brown with a white center since then it has colored up like this. Would this be a rainbow bubble tip?[attachment=0]2012-07-04_20-24-30_723-1.jpg[/attachment]
 
I have one similar, not as colorful and more on the red-er side. It get's brown and stringy 24 hours after feeding. Then bubbles up over nite again. My wife says it's just stressing as it poops
 
Got one just like it( it just split a few weeks ago ), but I don't think they are the Rainbow nems. Very beautiful species though. The best of both worlds. Red & Green !!!
 
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