hurt betta

I got two blue female betta first then a couple weeks later I got two red ones. I’ve noticed lately that one of the red ones is chasing one of the blue ones. This particular red betta I have noticed on several occasions chases the same blue betta. Today I went to look at my fish tank and...

I have a 10 gallon, heated, filtered tank that is divided for two bettas. One male one female. Last night my mom filled the tank up because the water was running low( have had the tank for about 6 months). I wasn't home so I couldn't tell her that she wasn't supposed to fill it up all the way...