moody fish???

What kind of fish did you put in? With your signature was that what was already in the tank or did you add those to your tank?

And what kind of plants? Are the angles new?

Angels are cichlids, and as such they're intelligent (at least IMHO) and territorial. If their environment was disrupted, they may be unhappy about it, but keeping to themselves in a corner sounds like it could also be a sign of illness, so I'd suggest keeping an eye on them.
My first angel was a nut, he used to chase fry into the plants, get stuck and then tear at the plants as if to say 'hey! Don't touch me!' - it used to make me laugh and usually got him a treat or two, which is why I suspect he kept the behaviour up.
The angel I have now is still very small (his body is about the size of a nickle), but is already showing distinct personality - he challenges the 3.5" BN plec, who is a solid, agressive fish, for food and sometimes wins. He's going to be a handfull when he grows up!

I've heard of otos or plecos eating the slime coat off of other fish, particularly angels and discus, from what I've read it can be an indication of starvation. Are you spot feeding the otos? They only eat certain types of algae, so it's possible even if there is algae in the tank they're not getting enough to eat. If the behaviour continues despite adequate food in the tank, I'd separate them.