7 DOZEN EGGS!! Gracious! I hope you have a gigantic brooder!
That's a very generous replacement! Sorry your first candling wasn't great, but it sounds like you've still got plenty to keep you busy!
My first candling went pretty well. Out of 28 eggs, I pulled one that was sweating (possibly old? It never developed.) and I pulled 2 blood rings. The rest all have wiggling chickens! I'll never candle before day 7 again. I could even see chicks inside the Maran eggs!
It definitely helps having a brooder full of chicks. It's a good distraction that keeps me from overscrutinizing what's going on in the bator. Those little ones grow fast huh? Mine are getting big for the brooder. I'm planning to move them to the coop next weekend. I have a compartment built in where I can hang the heat lamp. It's perfect for letting them slowly adjust to the outdoors.