I recently got myself a 20 gallon tank with a variety of small tetras, 2 corys, a weather loach, and a betta. After some trial and error with nipping tetras (red-eyes and silver-tips) I realized that the minimum number of each should be 6. Since then the silver-tips and the red-eyes have both stopped nipping other tetras, however the red-eyes have been taking cheap shots at my betta far too often. Today I noticed the betta taking charge a bit by nipping back and making a strong presence. I'm hoping this will eventually cause the red-eyes to lay off. As of now the betta spends most of his time in a hiding area he has claimed, although he does cautiously come out to eat and swim around every now and then. The red-eyes seem to only attack him when he is out in the open and his fins are an easy target. Is there anything simple that can be done about this? The betta is easily my favorite fish in the tank so I'd rather not remove him (especially because I have nowhere else to put him) and it would be very difficult to remove 6 red-eye tetras from my tank with all the plants and hiding places around. If anyone has any advice I'd really appreciate it.