as frustrating as this can be, this is normal. My snowflake eel, as well as most others (i know this because i too got worried and asked) have gone as long as 2 weeks without eating anything. They just do that sometimes. i will also go through periodes where i dont see mine for days, yet he pops back out perfectly heathry not long later. If you want to get him to eat, i recomend putting a crushed clove of galric in with the food you are feeding him, or even a product which is suposedly amazing called garlic extream. As for only seeing his head pop out of the cave... this is what they do. They will rarely move around at all from where they are. Mine gets in moods where he will be swimming around for a few mins, but this is mainly to change spots, and it rarely happens. He will also do it when he is realy hungary and gets jelous that i am feeding my valentini puffer and not him.
