Great profile!
Seriously though, DGs are psychotic. They use reverse psychology on you without knowing it! You can't define normal behavior of DGs because they're so versatile, so when a DG acts up you're like, "Oh no he's sick! But the water parameters are fine! Is this normal? Or maybe the LFS gave me a bad one! But they were like this at the store too! Oh what if that fish is bullying him?" It can go like that for hours, and then the fish is either dead or alive, and then he acts up again and the process starts once more. I say we should do some experiments and actually find out what is considered the "normal" behavior for these fishies.