Betta fish also often don’t want company. Although aggression levels vary between fish, both males and females are generally quite territorial, not to mention carnivorous. They will attack anything that looks too much like another Betta and some will view anything small as a yummy snack. At the same time they are also rather timid and vulnerable, which means they are easily stressed out by anything that moves too fast, is too colorful or wants to nip their fins. Lastly, they require relatively warm temperatures that are just a little too toasty for many other species and don’t do well in hard water with a high pH level.
Everything You've Wanted to Know About Betta Fish
i am terrified for my two betta fish. i have them each in a seperate 1.5 gallon tank. they are showing signs of their water being too cold. i am a teen though- my mom wont allow me to get a water heater. one of them is very bloated, and the other just hides in her shell (its tank decor) all day. im very concerned. how can i convince her to allow me to give them better living conditions? i have not taken the temperature of the water, i dont have a thermometer to do so. crossing my fingers.
What Fish Can Live with Betta Fish? - Aquarium Adviser
I have a betta in a 25 gallon tank with live plants. As well as some of the fish mentioned above and others that weren't. He's super happy, when ever I stand in front of the tank he always swims back and forth showing off his beautiful colors.
Can I put any other fish in with a male betta? - Pets Stack Exchange