This Pump as you saw will work on tanks as deep as 24 inches. So 55 gallon tanks 125 , and 75 gallon standard dimension tanks are all within range of what this pump can handle. So long as what you are running is a sponge filter your fish will be fine, if your attempting to aerate to save your fish….. i would get something bigger.
Here is a link to the Pump at walmart also check Academy for the same price everywhere else is 7+ $ for the small pump
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