Hi I have been treating my tank with copper for what I thought was ich and have lost a regal and tallow tang to it so far however this morning one of my clowns started swimming around the tank really fast then just died as I was fishing him out a worm ate itself out of the dead fish on closer inspection whatever it was has eaten my fish from the inside out, I took the fish with the parasite in a bag to my local marine shop who havnt got a clue what it is, it survived out of water and seemingly survived being put into fresh water, it has now been frozen and sent to Tmc to identify it however they advised me that it has more than Likely been what's killing my other fish, firstly can anyone identify anything like this and secondly my angel fish is now acting similarly to the clown but is taking a lot longer to die, guessing as he is bigger, any suggestions on the most humane way to put him out of his misery???