I agree with the commentators and the author that the float test, while fun to see the eggs wiggle, is not as good as candling.
To add pictures, use the add image tool from the tool bar. It will show up as drag image to it but you can click on the box and the browse for a picture
Thank you! Our boys have it the hardest when confronted with DIY no-waste no-spill feeders, so I'm really glad, too, that this feeder accommodates single comb roosters ^^