I have a Puffer named Merlin. I got him about 3 months ago and he has done great. We keep him in a brackish 20 Gal. Long tank. His tank mates were a few blood fin tetras. Yesterday we relocated the tetras because we are getting ready to get a 50 Gal. full salt water tank for him. Ever since yesterday he has stopped eating. I'm wondering if it's because we got rid of the tetras or if there might be another reason. Please help! I care for him greatly and don't want him to die.