I started my 65gallon about 3 months ago. I had 5 glow fish, two angelfish, 3 german blue rams, two gouramis, and 3 Cory cats. My first black veil tail angelfish was bullied and died. I thought it was the gouramis so I got rid of them. I replaced the veiltail with another one and this time I saw with my own eyes the blue glow fish attacked my angelfish. So now I’m thinking it wasn’t the dwarf gouramis bullying the first angelfish. This fish bit off the whole tail of my angelfish and this is what happened to the first one. For some strange reason though the glowfish did not messed with the only angelfish. I am saddened by this. I feel like I failed my fish because I am supposed to protect them. I read so many forums and goggled to make sure angelfish and glow fish tetras were compatible. Where did I go wrong? The tank is heavily planted with plenty of caves. Also do fish know when other fish are hurt? The silver and black angelfish stuck by the black ones side and tried to encourage her to eat. It was so sad.