i have a 20 gallon long fish tank i am taking some of my fish out of my 55...

JillZ

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...gallon and putting them into the? 20 gallon long and i have a 100 w heater and wanted to know if thats ok to use in the 20 gallon
 
That will work well. As long as there is some current around the heater it will distribute the heat throughout the tank.
 
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