While this post primarily concerns my Black Ghost Knife, I'm asking my question generally, not specifically. My query does not concern the BGK's habits, rather I want to know about your relationships with your fish.
Do you trust some of your fish more than some of the other fish in your aquarium? If so, is there any rational, or irrational, basis?
I don't trust my BGK. If I determine I am unsure he can escape from his hiding spot, I disturb my tank. I bought one a week ago and he died in under 24 hours (got caught in my filter), so I replaced him earlier this week. This new one is none too keen on living in a tube; he hangs out with my driftwood instead. Sometimes he wedges himself into the driftwood, and I just don't trust him to escape his crevice.
My dwarf frogs like to root around in my substrate (no surprise), and all this digging sometimes knocks around part of my aquascaping. This only thing I've noticed them truly displace is my large flagstone.
The fear extends to my butterfly fish, although less and less since I notice during the day he sleeps in my plants at the bottom of my tank, and my pleco.
I'm unsure if I don't trust some of my fish because of their cost (but I trust some of my expensive fish), because of prior experience, or because of the darned frogs!
Anyone else feel the same or have similar feelings?