Needing some advice about whether to euthanize my Royal Gramma (or not). I have had this fish in my tank for well over a year and have not added any fish for more than 6 months. Several months ago the fish started to act strangely and I thought it was not eating but it must have been because it is still alive. No visible marks on its body and at the time saw no signs of aggression from my other fish( 2 clowns, green goby and a high fin banded goby/ pistol pair). A few weeks ago I noticed the Gramma had moved from it's usual cave into another spot and the clownfish started to hang out really close to the new spot. One morning I found the Gramma lying on its side in the corner of the tank and thought it was a goner but I put it in a large breeder box and it seemed to recover but is clearly stressed and not eating. I set up a new 40 gallon tank and it is now cycled so I released the Gramma in the new tank hoping that might help calm it down and allow it to recover but I am afraid it is just suffering and will eventually die. So...should I humanely end it's suffering? Any advice would be appreciated. TIA