I've read a post about feeding fish with orange. I've just put a slice of orange (about 1" long) in the tank. Ram tried it once, then Rosy Barb started tearing it apart, but was scared away by Ram. Then, the crab came, grabbed the slice, which was not much smaller than the crab itself, and dragged it into its cave! It ws really funny to watch! Now, I'm going to cut one more slice of orange and put it at the opposite end of the tank so fish will get the treat also.