nipped fins

I have been having a very annoying problem in my tank for quite some time now. It originally started with a Majestic Angelfish that I had purchased. I noticed that the Angelfish and my Powder Blue Tang were getting nipped a bit and the Angel was getting the worst of it. At the time, I had a...

I'm a newbie to aquariums and started with a 20-gallon freshwater with a beautiful Red Ryukin goldfish (named Angelina Jolie!), some sunburst platys, some yellow lyretails, and a few neon tetras. My tank's been going strong for almost 2 months and I got brave. I thought I'd take a shot at...