I bought a dog face puffer 4 days ago. He has been fine and even eating from my hand. Today he is just lying still and breating a little hard with no appetite. He is in a 50 gallon with about 40 lbs of live rock. I use prime to condition my water. My nitrites and ammonia are up to .25 I did a 5 gallon water change with no change in water parameters. What do I need to do?