That's a wound...

[Randrew215]

My yellow tang has a White shard sticking out of it that matches the shard I see seems to be missing from the scalpel-like fin of my brown powder tang. Both seem very healthy. I haven't noticed aggression between the two in my 90 gallon tank, but the yellow tang did almost double in size the last year ANC now rivals the size of my brown powder tang. I'll try to photodocument but alli have is my phone. Does this mean their era of cohabitation is at an end?

 

[josepha]

How big is your tank? Tangs will occasionally fight, but if there is not enough room to "run" and the walls seem to be closing they will get stressed and be open to infections and death. Need 6 - 8 feet of space and/or 75 gallons or more for 2 tangs