14 eggs!
How uncomfortable do you think it must have been for her to be carrying that many eggs at once?
They showed a preference for the bottom mop that was towards the back of the tank:
Then again it could just be that the mop is smaller so it was easier to spot the eggs. But despite being smaller there were a few more eggs on it.
Now to test them with methylene blue to see if they're viable. I've recently read that methylene blue doesn't actually have much, if any, anti-fungal effect. What is actually useful for us spotting which eggs aren't viable. When the egg gets fertilized the "shell" hardens to prevent it from getting fertilized again. Eggs that aren't fertilized have a porous shell so the blue can get in and you know that the egg isn't good and we'll rot.