Hi, I am completely new to both the forum and to tropical fish (although I have had coldwater for years). I have a heated BiOrb 30L with 2 DGs. However, the smallest of the 2 seems to have bullied the other into complete submission, to the extent where he is scared to emerge from his plants.... They have lots of hiding places, 5 plants etc... Should I take one of them out? Do you have any helpful thoughts?