crazy swimming

I purchased to male bettas a couple months ago and at the pet store they told me to get a tank with a devider in it and they would be fine. Unfortunately they were not and one of the males started to attack the other through the devider and slightly damaged the fins of one of them. So I quickly...

Is this normal? Cheetah is swimming around almost like he is looking for something and wants to get out of his tank. I got him about 40 hours ago and he started eating yesterday and the water is clean and everything and it is heated. Does he just have a lot of energy??? I attached the video in a...

I got a betta one week ago. A few days ago, I noticed one of his fins (the little ones he swims with, not the tail or flowing ones) had white fuzz on it. Over the course of the day, his fin started looking smaller and the fuzz got bigger until he had a trail of fuzz and was not using that fin...