It could possibly be a few things....
1.Its a female and this is known as the egg spot.
2.It has a infection (bacterial or parasitic) under its skin that should be treated.
3.A small white dot could be ich, also will need meds.
4.Or it could be a birth defect of some sort.
If the "bumps" are red and angry looking your fishes water is putrid and you are killing the fish by neglect. If the lumps are just like ripples there is nothing to worry about. Check what follows and see if you are doing things right for your Betta. 1 Betta needs at least 3 gallons of water kept at 78F (despite what the uninformed say). It should have a permanently running cycled filter and it also needs to have at least 50% of its water replaced every week.
your fish may be bloated. is it on his belly? if so he is either fat or bloated. feed him cooked peas chopped up and hopefully it will go away
It could mean that you are over-feeding your fish. A male betta fish only needs to be feed about 3 times a week.
Sorry there either sick or pregnant
Some male betta fish are not as aggressive as others.
male
Yes. Betta Fish do change their coloer every now and then. Or if you have a male, he will change his coloer if hes chaseing a female Betta Fish. Or if he sees another male Betta Fish.
yes
None are recommended if the Betta is a male.
She breeds with a male Betta Fish.
Male Betta's are solitary. They cannot be placed with other fish. That's why they are known a Japanese fighting fish. They will kill other fish for territory.
No. Betta fish will attack each other no matter the sex.
Yes they will.
The Betta fish want to kill eachother. That's what all Betta fish want to do, that's a natural thing.
No.
keeping multiple bettas in the same tank is not reccomended