I have four, and I would have bought more but that is all the store had at the time. When they get more in I plan on adding to them, and yes I tried feeding them frozen bloodworms (after they were thawed) but they just let them float down to the bottom of the tank.
I can't tell if my glass catfish/ghost fish are eating. They never seem to see or smell the food and even though I have had them for two weeks now I have yet to see any of them go after food. Any advice would be greatly appreciated!