I may sound nuts. I can't help but think fish in qt die from depression. When I put my melanuras in the 60g by himself, he shut down. He would peak once in awhile, but for a few days, he wouldn't move.
Husband asked me whats going on with him and why was he in the 60g. I told my husband, he's lonely and he's going to Flora. He took us to Flora that weekend. He couldn't stand seeing the melanuras looking like that.
@fishguy242 can tell you I'm not kidding.
After he added the melanuras to his reef, it was moments before he was swimming around again. Scopas tang and cleaner wrasse checked him out.
Fish hate qt.