We have a snowflake eel when purchased 3 months ago was about 4" in length now he is approx. 14" long. He has been eating well with a mixed diet of shrimp, scallops, clams etc. He has been a big eater until the couple of days. He doesn't want to eat, normally this guy is a big digger and hiding out. Now he is in a cave area and stretched out and just seems to be off in behavior. The tank is 78-80 degrees and the water is testing out great. I have done partial water changes. Any ideas or is this normal for these guys????