I would think even 50 is too high for quail, but I haven't tried quail yet. Do you have something else you could put the goose egg in? I have seen successful hatches on here in as little as a glass dish under a heat lamp. Cover with saran wrap, poke some holes in the plastic for ventilation, add...
Nuclear bomb, ugly black mess?? Haha, I can't say that I've ever hatched one that I would describe that way. I did have some hatch that alot of the veins had gotten really dark.
I hate to recommend anyone throw an egg out, so I hesitate. But if you see no veins and you are sure its day 10, then it is most likely clear. But... Do you have others that are 10 days and more obviously developed? Is your candling light strong? If you need the room, I'd say pull it, but if you...
Do you mean the 4 day infertile pic? Are you saying you see no red lines? If it still looks clear at 10 days, you can leave it for a few more days, but by 10 days you definitely should have some visible veining. If you meant that your 10 day egg looks like the 4 day fertile pic, then I would...