Your ghosties should be fine as long as you give them places to hide. Little rock caves are fine. Dense plants are excellent. I've had 7 of an original 13 in my tank for over a year now and that was with 2 angelfish. Yeah, the angels got a few of them, but not all. The remaining ones just hang out in the rocks and plants. Some are pretty bold and swim for food....the angel (there's only one in my main tank now) doesn't even really pay attention to them anymore. He's too well fed on bloodworms and frozen brine shrimp.