I think I have a bully in my tank. A little back ground I have a 75 gallon and have 4 angels small 2 silver dollars same size as angels about 2" 2 clown loaches about 2 inches and a common pleco about 3" Ive had the angels and pleco for about 3mo the clown loaches for about 2mo and the silver dollars for about 2 weeks. All has been verry peacefull except for about 2 days ago I caught my 2 marble angels fighting for about 15 seconds neither one backed down and it just stoped. Well today I get home and one of the silver dollars have the middle section of the top fin gone both marbles are missing the tip of the top fin and my blue angels top fin has a tear and fold at the top fin. The zebra angel both clown loaches and the pleco are fine. I dont think its rott because i did not notice this before i left for work and 8 hours later this is what i find. I have never seen any fin niping before just a little chasing here and there besides the 2 angels for dominance. Any thoughts??