This is probably the reason why my two Convict Cichlids aren't getting along. They are fairly small, at only about 2 inches in length, however one seems to be annoyed with the other. Each time it sees the other come out in the open it usually darts at the other. Kind of like he doesn't want to see it's face. First I thought that maybe it's because they are both males, but now I'm wondering if they do that because there isn't enough room. They're in a 10 gallon, by the way. I've been thinking about converting my 29 gallon community tank into a Cichild one.