I have 2 of them in a 55 Gal with 4 Golden Gourami, 3 Black Widow, 2 Clown Loach and 2 plecos. They seems to get along fine. I bought them when they are about 2 inches, and now it is around 6 or 7. I had them for about 6 months. The Black Ghost like frozen Blood Worms the most, but will also take pallets.