They are good for my aquarium. I put my sword plants in there and my algae eater won't scatter them anymore. They get stuck on the side and cannot move easily. But I can still move them if I try. The main disadvantage is the glass handle that connects the cup and the suction cup. That's ridiculously stupid. I ordered 2 pairs and one of the mugs arrived broken. Customer service was able to handle this and offered a voucher to replace the broken mug. EDIT: Had to downgrade it one star because again one of them broke and pinned it to the side of the tank.
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