Danio chasing my other fish?

I recently posted about my angel fish/danios being sick and learnt that I haven't gone through the nitrogen cycle so that was probably why. My ammonia still hasn't gone up so my PH is at 6.6 and everything else is at 0ppm. So I have just been waiting for the cycle to get going. The other day I noticed one of my danios was bloated but I was told it is probably just a female and that they are bigger. Well today I fed my fish and watched them eat and I realized the bigger danio wasn't letting any of my other fish eat/was chasing them away. Also it is a LOT bigger then it was yesterday. I've seen it chase the other zebra danio before but I assumed it was just playing with it. But now I am thinking it is really sick. I posted a video I hope works.. I had to use photobucket because the uploaded on here was not working. help?!

 

That does look like a female danio. How many danios are in your tank? They are schooling fish that are notorious fin nippers. And their aggression is heightened when not kept in correct numbers or when in an uncycled tank.

When feeding just drop some food in opposite corners and all your fish will get a bite to eat.

Welcome to the forum.

 

There is only 2 right now because one died. But I will add another one once my tank has cycles. I am positive it is more bloated and swollen then the other day. Is there any reason for this?

 

Don't overfeed while you are cycling. It only adds to the ammonia level and your fish are stressed enough. Danios are psychotic little fish. They bug a lot of other species. They bug their own species. They bugged me. I'm happy to not have them any more.

 

Don't overfeed while you are cycling. It only adds to the ammonia level and your fish are stressed enough. Danios are psychotic little fish. They bug a lot of other species. They bug their own species. They bugged me. I'm happy to not have them any more.

100% agree with this statement, 100%.

 

I try not to overfeed but the stupid danio swims around so fast all my food floats to the bottom and gives my other fish about 10 seconds to eat before its all gone. Ya I would never have gotten zebra danios but when I was listening to the people at the petstores they told me I could only get 3 of those in the beginning