I'd give it s couple more days at least, and then just scrape the surface of the soil and look for it.The 3 that have sprouted all seem to be doing ok, will post pics later. I've given them around another 50ml each.
A bit concerned my 4th seed has not broke soil, it's still under the humidity dome. I remoistened the top soil this morning and nothing to report. At what point do I cut my loses?