THANK YOU. I've been trying to find out what my knife fish was, and no one could tell me. When I finally did, I had the wrong name..
Not seen it traded, and have absolutely no idea if it adapts to a more manageable diet. There are of course sponge-rich foods sold for marine angelfish, but that'd be a long shot.
Cheers, Neale
Apparently they like bloodworms, at least my little one does (already hand feeding). I've only had him for about 36 hours, and I can easily say, this is definitely one of my favourites, absolutely love it. And it's adjusting pretty well too, especially for a wild caught fish.