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I have a patch of white stuff above the water level...looks like someone sneezed on the tank...thats overnight...is that mildred laying eggs? she is an apple snail.
It very well could be! I dont know what you consider "someone sneezing on the tank" looks like

but its a good chance its an egg clutch. Do you know what kind of apple snail she is?? Is there a male in the tank with her?? If you really want to know - mabey you could take a picture to show us?? Good luck with the potential new babies, and let us know if you need a hand taking care of the eggs.
Beautiful fishys by the way!!