I am new here! I have a large green severum in a 55 gallon tank. He is 10 years old and just last night I noticed that he could not stay straight and is not struggling as he lay sideways at the top of the water and floating with the current! I think he is just old and I hate to see him suffer! I was wondering what was the best way to put him out of his misery! In the past I have put my fish in the freezer until they "fall asleep" from the cold and never wake up! I just wanted to know what anybody thought of this?