question about fish tank?

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what can I do

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my heater is a submersible heater, no adjusting at all, it stays at 78F
have you ever had a heater like this? its 100watts, it doesnt heat my tank very well, i thought it would. What is wrong with it, it just makes the water cold. I cant return it because the wal-mart i live near doesnt sell any other kinds. It says its for 10-30 gallons, i dont get it, whats wrong with it? thanks for your help:D
 
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