I have a zebra eel and a snowflake eel that never come out they used to come out at least once and awhile, but now its hard to get them out even w/ food. One big problem is I think my zebra eel is very shy around fish since I had a dogface puffer in the tank that I got rid of since it chewed up his tail. Now I never see either of them out. Any tricks? I have been trying to get them further and further out with food, but not much progress at all.