My new storm clowns are looking healthy but my last one died I think from stress so I bought another and my one from before was chasing him around ... so I think that’s how the last one died , so now I took the aggressive one out and into my QT tank for 3 days hoping the other would settle into the tank and become comfortable but now I’ve put the other aggressive one back in and my clown is swimming quickly in one spot with his head up and I’m not sure what to do. Don’t want to have to buy another ....