headstanding

Hi, I am having my pearl arowana for past 1 year and its always active. Today also i saw at 9.00 a.m it was doing fine without any symptoms of diseased, but when i saw it again by 12.00 p.m it was floating vertical having head up and tail down. I can see the eyes, mouth and gills movement. I...

My flowerhorn is about 3 inches now. It will be 3 months old this coming Nov. 10. I transferred it to a bigger tank two weeks ago. Since then, its color turns darker and darker everyday. He is very aggressive though as always. Eats a lot as always. And plays around the tank (goes up and down and...