No more blood in that membrane? Any action from the other eggs? I think it can be a good 24 hours from internal pip to external pip, and in this case, the internal pip and external pip were both the same. So, you could just wait a bit longer. I'd wait it out a bit, since it appears that the...
Have you dampened the membrane with a wet q-tip? If you do so, be very careful that you don't get any water inside the membrane. Some folks use a bit of neosporin on the membrane. Be sure it doesn't have any pain killer med in it. I'd be most comfortable using water. I'm guessing it's...
What is your humidity at, what has been your bator temp? Have you had any other chicks hatch from this group? I think that at this time, I'd do a very careful exploratory removal of a bit of shell around the pip. If the membranes are blood free, you could enlarge the hole a bit and start a...