Angelfish Rolling?

So I added one of my quarter sized angelfish into my big tank with my other angels yesterday. The other similarly sized angelfish that was with it is doing fine, but this one keeps like rolling in place if that makes sense. Sometimes it'll look straight up and then keep going and be upside down, other times it'll lean over sideways and flip over, I can't get a good video of it because every time I go near the tank it stops and looks at me.

The angel it was with came over to the one in question, and it stopped everything and followed the other. Is it doing this because it feels lost? I had them in a 10 gallon growing out. Also the other 2 bigger angels that were already in the tank sometimes pick on it and the other one, but not very much as they're on separate sides of the tank usually.

 

If it is flipping over it might be a swim bladder related issue (not a terrible one if it is able to control its movements well).

 

If it is flipping over it might be a swim bladder related issue (not a terrible one if it is able to control its movements well).

That's what I was thinking, but I don't know what would cause it. I have a UV sterilizer lamp, so I don't think it's bacterial, I don't over feed, it isn't constipated because I saw it poo earlier today and it looked completely normal. Is there anything else that can cause sbd?

 

It could have taken a hit to the side or have genetic issues that cause problems with the organ - a larger angelfish can strike and kill another if it hits it right (causing internal bleeding or organ failure due to bursting from the trauma). Keep an eye on him and keep the water pristine as best you can (more often water changes if you have too, won't hurt the fish).

 

It could have taken a hit to the side or have genetic issues that cause problems with the organ - a larger angelfish can strike and kill another if it hits it right (causing internal bleeding or organ failure due to bursting from the trauma). Keep an eye on him and keep the water pristine as best you can (more often water changes if you have too, won't hurt the fish).

I did a relatively big water change earlier so hopefully that helps.

I turned the room light on to look for something and I looked at the angel, and it was laying on its side! It got up and swam away when it saw me, but I don't know what's going on!

 

WHAT IS GOING ON??! It was upside down for a solid 30 seconds, and it keeps getting caught on the filter. What do I do? It was completely fine in the 10 gallon.

Here’s some pictures. He won’t stop laying on his side now. I have him in a breeder net to see if I can do anything. I tried feeding him to see if he’s hungry or anything and he ate a little but not very much..

 

If he makes it through the day he has a chance at living but when they go onto their side something is wrong - however I haven't had anything other than time actually save one of them that has gone down.

 

If he makes it through the day he has a chance at living but when they go onto their side something is wrong - however I haven't had anything other than time actually save one of them that has gone down.

It made it through the night and it's back up and swimming inside the breeder net. It actually started swimming again late last night.