If you've only had the eel a week and it's eaten 3 days into that, I wouldn't worry too much yet. Eels are best fed every few days or so, not every day, so going a few days to a week or two is not a problem for them. With the snowflakes being primarily crustacean eaters I would go with feeding them mostly krill and prawn with only the occasional silverside. Make up a feeding a stick and skewer the food on the end of the feeding stick, than wave that in front of the eels face every couple of days. I bet it won't be long before it eats. Never had one take more than a week to start eating, and maybe another two weeks to learn to respond quickly to the food offering. The garlic might help, and juice from fresh squeezed is fine, though I've never had a snowflake be enough of a slouch to use garlic for them.