Here is my Betta when he first got his colors
The description is in order of the pictures.
6 months old, 0.75 gal tank
His new 1 gal tank, 9 months old
Same 1 gal tank, 1 year old, yeah he suddenly changed
Brand new 5 gal tank, 1 year and 3 months old
And at night time he looks cool
He seems to be less flary but more energetic in his new tank. As you see in the picture he always keeps his fins folded (5 gal), whereas in the old small tank they were always fully open(1 gal). Also he has a ghost shrimp that always tries to piggy back ride him (can't take a picture of that because everything turns into a high chased chaos and I can't afford a good camera).