So 2 of my angels have some not so good looking tail fins (noticed one a day or so ago and the other 2day) I dont have water params right now but will shortly. Is this fin rot and if so how do I treat it. There isnt an over crowding problem but I have been changing the substate and was searching for a missing eel in the substrate. Could stress be causing this? and is there some fishy valium I could trow in there But seriously is there meds I could should use?