Candling addiction? When I have eggs in the bator, the first thing I do as soon as everyone else is out of the house... or has gone to bed for the night, is grab a few eggs and sneak into the bathroom to candle them. Just a few. After all, if no one sees me do it, and I don't candle the same ones over and over, it hardly counts, right??? Besides, it's educational. Start at day 3, doing a comparison between incubated and non incubated eggs to see if signs of life can be detected.
You're not the only one! Oh, wait. . . I see Amylynn and WV have already given you ovation.

Thanks for both tips. I've heard that about the flashlight app more than once.I use copper sulfate... got this advice directly from ozexpat... TSC doesn't carry it, but some co-ops do, otherwise you can get it from jefferspet.com...
Instructions on package are stronger than you want... I mix 1lb pkge in 2 gallons of water for stock solution then add 1/8 to 1/4 ounces of solution to every gallon of drinking water... works in plastic standing waterers and in pvc lines... stains and has a bit of residue, but no algae, mold or slime and healthier... oz swears by it and so do I...
Oh, and I use the super bright flashlight app on my smartphone for candling... works great!
Gash, I'm so behind. lol By the time I catch up, E1 is going to be in bed or in the bathroom "candling".