You mention that you have waited a week after they hatched, right? If this is the case, then you need to wait longer. They need to shed first, and then be offered food. It takes 7-10 days after they hatch until they shed (usually). Then they all get their own tubs, a day or two of settling in to their new tub, and then a meal offered.
Of course, looking at the date of when you started this thread, they've likely all shed... Give them a couple days of uninterrupted peace and quiet. Then try them again.
We had 2 last year that we had to assist feed. We didn't do that until they were 6-8 weeks old. If they absorbed the yolk, they have a little while still before assist feeding is necessary. Both are thriving now, though, and only needed assist fed 3 times each. Good luck!