Had a PBT for 4 years. As it grew it had a few boughts of ich, but nothing good food and water conditions couldnt cure. Many academic places consider ich an opportunisitc disease, not certain death.
Anyway, my poweder blue grew to 5 inches, then I gave him a way. He was just too aggressive. In 75g he bullied to death a powder brown, then in a 180 he bullied to death a clown tang, achilles tang, and moorish idol. I had that idol for 2.5 years and when he died I had to get rid of the PBT. After that a blonde naso that he bullied finally starved to death.
I kind of wish the tang police beat some sense into me before. But PBT was a such a beautiful fish.
Now that PBT is gone the other fish are a lot happier.