When I got home today I found all my fish hiding which started to worry me..and then my Yellow tang came out with a red blotch on his tail and I thought initially that he got in a fight with one of my fish, because the blotch is dark red like blood. But then I saw that my puffer was without injury and my angelfish was hiding along with my blenny. My blenny has come out but my half moon angelfish is still hiding within the rocks and I'm worried as to what the hell happened...My water parameters look fine and I have no clue what I should be doing to help out my fish.
