Typically inflamed gills are a sign of ammonia poisoning. Make sure that you clean the water every few days if your betta is in something smaller than 5 gallons; if you have your betta in something bigger, then you should change 50% of the water each week making sure that the new water is the same temperature as the old, and add in the recommended dosage of water conditioner per the directions on the bottle.
If your beta fish is puffing its gills out at you when you are looking directly at them then your Beta maybe trying to intimidate you. There is also a possibility your Betas gills may become inflamed because of bad water conditions, or perhaps from a bacterial infection.
Of course they can all fish have gills which allow them to breath in water.
I believe you mean Betta fish. No, it should be fine. You can treat you Betta fish by giving them bloodworms!
Some bettas just have dark gills, even the white ones.
Betta fish live in rice paddies in places like Thailand. These paddies are miles long but shallow without much current. So the betta fish slowly developed the labyrinth organ which allows the fish to breathe air from the surface rather then use its gills.
It means he hates you. Bettas flare their gills out when they're trying to scare another betta away, or to impress a female with how large he is.
Well, if you love your Betta fish, then it should live by itself. But if you add another Betta to your current Betta fish's tank, then they will start a fight because Betta Fish are Siamese fighting fish and if one Betta is in contact of another Betta, the possible reason would be a fight between them two.
If you want an active fish that moves around a lot then a Betta is not for you.
Not with many fish, although holding a mirror to a betta will cause it to flare its gills as it will think its reflection is competition
fishes uses the oxygen resolved in water.
-white fins not moving -gills not moving - sink at the bottom of the pool - may smell
Betta fish get in fights with fish with colorful fins and bodies. If your betta gets in a fight while your away,the weaker fish may die. But if you see your betta fight with another fish you should try to split the two fish apart [or all the fish that are fighting].