Hi. welcome to the forum! Glad you joined, just wish it were better circumstances.
Some hatch early, some hatch late. The first was a little early so I advise patience. I'd wait at least another 24 hours on the other eggs. Right now I'd say it is unlikely any more will hatch since you have no pips and no movement by now but it is possible.
If the first chick is healthy and absorbed the yolk it can easily go 72 hours after hatch without eating or drinking. There is no immediate rush to remove it as far as its health goes. As long as none of the other eggs have pipped you should be able to remove it safely now if you wish.
I hate trying to raise a lone chick. Sometimes they do quite well but sometimes they don't. My suggestion is to add a mirror and a small stuffed toy in there to keep it company. That seems to help a lot of them.
Is a three week gap too big to add more chicks? Sometimes it works fine, sometimes it doesn't. With living animals you just don't get any guarantees. On that level, there is nothing wrong with trying it. It might work and you obviously wanted more chicks.
But why was your hatch so bad? 8 out of 13 developing chicks isn't great but it isn't horrible either. But having 8 viable eggs going into lockdown and only one hatch isn't very good. I'll include a link to an incubation troubleshooting guide that may help you determine what went wrong. Once you decide the hatch is over open the unhatched eggs and see if you can determine when they died and what might have caused it. That guide is written more for commercial operations than for us but maybe you can get some help.
Common Incubation Problems: Causes and Remedies (ucanr.edu)
Did you turn the eggs the first couple of weeks of incubation? Were eggs incubated pointy side up, which is bad? Were they laying flat or pointy side down for hatch? Did you confirm that the incubation and hatching temperatures were correct? Don't solely rely on the instruments that came with the incubator. Sometimes they read incorrectly. Were they shipped eggs? Sometimes they get shaken so badly during shipping that they don't hatch, even if they develop.
Sometimes you just get horrible hatches, even if you do everything perfectly. But even my horrible hatches aren't this bad. I'd want to try to figure it out before I started more eggs.
Since you are using Fahrenheit I'll assume you are in the US. You can try finding your state thread in the "Where am I? Where are you!" section if this forum and chat with your neighbors to see if they have any chicks available. Call your county extension office and chat with them, see if they know anybody that might have chicks. Try Craigslist or something similar and see if you can find a couple of chicks locally. Go to your feed store and chat with them. Even if they don't know anybody they may have a bulletin board where you can post an ad for chicks.
Good luck and once again,
I don’t want to give up hope but I’m also a realist.
