Can't say for sure how long it lasts or how it works. For the price I paid I'll just hide it. Why? It's huge. I've never seen it, but from the photo I thought it was a lot smaller. Thank god I didn't buy 2 packs. I'm afraid my fish will have their tails or fins cut off. The blade is near the opening of this device and I feel that this is too big a hole to fit in an aquarium with fish. It should have been less at the front opening. Can be suitable for a very large aquarium with very large fish. You should explain it with this model. There was no magnet in the box. Hope it was new! As stated in the box! UPDATE: 7/9/20 I've been using it for a while and it's actually safe and has a strong current. The fish is ok. I love the fact that I can move it and it helps move all the gravel debris around so I can scoop it out with a net or vacuum it into a filter. This is funny! You'll be amazed at how much comes from the bottom up. This reduces the time it takes you to empty the tank, especially when you're lazy.
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