This thing is amazing. Used this for my 125g. Attached two large sponge filters to it in case of a power outage and it worked great. Very expensive but worth losing all my fish. (Over $1500) but great pump. It has a built-in battery that lasts forever and when it runs low. You can take it out and just add batteries and it will be dead. There were two options. High, which stays on all the time (14 hours), and Low, which turns off for a minute for a minute. (28 hours). Maybe just take another. Hope that helps
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