I haven't been on this site for a while, but I am glad to be back ;)
Well 2 days ago, my poor Betta died after a water change, I don't know when I put him in a bag to float, I think the bag opened up and the new tank water shocked him and he died :( But I think he was getting old, he stopped flaring, his color was dying down, and I think his system was shutting down on him as he would always hide in the corner and just rest there and not be as properly active, and salt baths were not helping as they use to do. I don't know how long he was at that other pet store in that cup, so....
Anyways, after Moon passed away I went to Pet Habitat this time (at the mall) and I picked up a beautiful light red Betta, he's a male, but when I first looked at them I thought he would be a great fish, I let him in his new home yesterday night and he was loving it, he was exploring and he was so interested in everything.
The only problem I am having with him is that he likes to flare a lot, he flares at the filter a lot and the corners he flares a lot, and well were ever he swims he's flaring he can non-stop flare, he's flaring every second. The Lil guy has anger problems

and when the main light of my living room is off, and it's really dark and the tank light is on he starts flaring and gets mad, and when the main light of the living room is on and the tank light is on, he stops flaring. And when the tank light is off sometimes he stops flaring, but he still flares.
Is this bad, as he's flaring non-stop, he also prefers to stay at the back of the tank. But every 10 seconds he flares. But is this because he's new to the tank, and never really had big open space? I don't know how long he was at Pet Habitat for, but he was in (show case cup) kinda like something you put on a table, and fill it with rocks for decorations, he was crammed with 50 other bettas on this shelf which look like it's going to fall as it holds so many.