My experience: It is so brittle that with normal handling it has developed a long crack. Trying to reattach the suction cups was a challenge, but they certainly won't accidentally detach from the device. My other fish keep getting stuck between the block and the tank wall. :( It should have a tab on the bottom so it doesn't touch the aquarium wall so other fish don't get trapped. If the material was stronger they would add a tab on the bottom of the adjacent side aquarium wall.. I would buy more. Now, if you'll excuse me, I have to release my two captured female bettas that are stuck between this device and the wall of my aquarium. :(
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