I should have known better but put my Goldfish in a 20 gallon tank before it was fully cycled and now she has ammonia burn and red streaks! She is not moving much and stays at the bottom. I have had this fish for 7 years and am very upset - I bought her a bigger tank I found at a garage sale thinking she would appreciate the space - I put her in too soon. I bought a new filter and changed the water 4 times at 25% each day - also put some ammonia remover in. Is there any chance of her recovering??? They say it is a slow death - should I euthanize her if she gets too bad??? PLEASE HELP!!!