Would it be ok to put a 1-3 gallon 7.5 watt aquarium heater in a .5 gallon acrylic tank?

I have a betta in a 1 gallon tank. Unfortunately being in college I have to take the fish with me on weekends I go home. A gallon tank is difficult to do that with so I have a half gallon acrylic tank for those weekends. As the temperature drops I realize I should get a heater and cannot find any for tanks smaller than 1 gallon.
Asked Nov 17, 2014

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.