I have a snowflake eel tht I got from a friend last week And the eel has yet to eat. I have offered it silversides( Thts what my friend fed him) and every time I get near him with the food he just goes back in his cave and doesn't even attempt at eating it. I even tried to feed him in the middle of the night. He is very active and seems healthy my tank readings are zero across the board. Idk what to do any help would be great!!!