That's a good question. The ghost doesn't bother the gouramis unless
they try to get in his hiding place. This is probably why the
gouramis are so shy...they don't really have place of their own and I
don't have room for more than two hiding places in the 38 gal (the
pl*co takes the other hiding place). I think the situation would be
similar with the Angels. If they tried to mess with the ghost I think
it would be bad news for the Angels.

As I mentioned in another post, I'm thinking about getting a 75 or 90
gal and trying the set up in there along with the addition of more
hiding places.