stable tank temps are important, a controller is a good way to help keep a heater do what it should. you can get a ranco controller for pretty cheap.
http://www.automatedaquariums.com/ranco.htm
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Given sufficient thrust pigs will fly just fine.
90 Gallon LPS tank - Challice, Acans, Favia, Diplo and Zoos
125 Gallon SPS Coming Soon!
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