What to expect. good spin, but cohesion is very unstable. A slight glance may shatter the "lightbulb" as it emerges. I'm really surprised it stays attached while I work. No big deal so far. In an aquarium I would be a bit more concerned because if it falls out everything in the tank that gets in its way will explode. It is used in a 55 gallon grow tank for irrigation along with another tank of the same size. One below, one above - oxygenates and mixes my dry nutrients into the solution. Reduces biofilm growth even on sides with a good flow.
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