I buy so many suction cups that they are now disposable. Now accept this fact when using them in an aquarium. These last from two weeks to a month and then give up. I've seen worse. I've seen better. Initially began to show a milky white color after a few days. They change shape after drying, but don't last long. Like most suction cups, they are all disposable. I have some that last a few months, but their cost rarely makes sense. Your choice. How often would you like to replace them?
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