I use them in my aquarium to grow small leafy plants that help purify the water. I like them a lot, but being constantly submerged in water makes the suction cups poorly absorbed. It's not a problem unless I've moved them, then they don't want to stick. I found a solution to the problem - when I need to move them, I take them out, remove the suction cups, hold them under hot water and twist the suction cup to give it a suction shape and remove the flat. They hold up well until I'm ready to move them again.
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