As far as I know yes.
Also this little note. Them bastiches can sting the he$% out of you.
It is going on 5 weeks since one got me in the finger. It is still rough where it got me. About a week afterwards a big hole opend up where it got stung.
I didnt see him all blended in, reached down to clean, and BAM!!!! It hurt and bled real good. LOL
OUCH I've been lucky so far (knocks on wood desk) Mine is full grown 9.5 in. and has been around the block (a few different owners) about 3or 4 yrs old. He changes color all the time like scooty mentioned. What I do to not get stung is put my big blue net in the tank between where he is and where I am...he knows what the net means...and don't like it.
I have never known one to sting aggressivly. Mine would eat out of my hand. Just do not bump them and you will be fine. Everyone I have seen does the color change thing when stressed etc.