Lethargy, grey belly, bulgy eyes and rapid breathing are signs of a sick betta.
Fin rot usually looks like the fins have black or red edging with tears and bits falling off.
In a petstore if bettas are not carded they get desensiised towards each other and don't flare as much. Left alone long enough, they should flare again.
And yay new betta! Don't forget pics :)
"You are forever responsible for what you have tamed."
Betta love: it's an international thing.
Azure, Sterling, you will be with me forever. Peaches, my crazy girl, I'll miss you the most.
The Boys: Tranny, Inky "Yume" Zuko, Mao, Onishiki, Chopin, Maelstrom, Kabuki
The Girls: Kamikaze, Beeuty Qveen, Beefcake!, Chunkers, Awesome Sauce
Meeces: Koko, Bijli, Baadal, Barkha
Turtle: Hi Handsome (female -__-)