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looks very much like a Trichogaster labiosus
Thick-lip gourami to me
 
He's very pretty :thumbs: The color changing happens according to mood mainly. They'll go darker when breeding, eating or are generaly 'excited' for whatever reason.

I actually think it is a banded rather than a thick-lipped but it's not that easy to see from that small a pic. One thing you can use to tell the two species apart is the shape of the caudal fin that tends to be a lot more forked in thick-lipped gouramies (Colisa labiosa) rather than sort of fan-shaped. Bandeds also usually have little blue and red dots on their fins though these are difficult to see on some fish and I can't tell whether yours has them. Here's a pic of what I mean: http://fishbase.org/Photos/PicturesSummary...mp;what=species Look carefuly at the dorsal and caudal (though this one's very pale - top one, BTW, the bottom one's female). Some thick-lipped gouramies also have this little black line where their mouth is but, again, it's impossible for me to see whether yours has it. Finaly, size - thick-lipped gouramies stay about 1" smaller than bandeds. How large is he? If he's over 3-3.5", he can't be a thick-lipped.
 
He definitely gets darker when he's eating. He's about 3 1/2" now, including his tail which is fanned... not any forking at all that I can tell. His tail is mainly red with some blue dots on it. He doesn't have any kind of line where his mouth is, but there is a dark line a little below his mouth.
The picture I posted is about the palest he ever gets... I'll try to get one of him darker.
 
Here's another couple of pictures, though I don't know that they'll be of any more help.

gourami2.jpg


gourami3.jpg


The top one really shows his tail shape, and the bottom one shows the silver line under his mouth with the black line under the silver one.
So, anymore guesses? :hey:
 

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