Actually no they weren't, the guy at the LFS store told me they are really good at hiding and if you see them in action, they can fly faster than any fish, must keep holes covered tho, I found one on the floor this morning. There is a half inch gap at the back where the filter tubing runs in, &^%$#
Looks like they're they're own worst enemy. I'm going to lower my water level until I can get a mesh to cover it.
I have yet to see my bkg harass another fish, he doesn't like them near his rock cave, and will push them away. Its funny to see a cory wander near and the get the boot. He's a gentle meanie. Now, my pictus cat is another story.... I'm more worried about him consuming the little guys than my 'mean' old black ghost lol.....