When buying aquarium fish tank heater what should you consider? Dear aquarium hobbyist, today I write for some point to when you buying aquarium fish tank heater and what should you consider. Fish are cold-blooded creatures; Their internal body temperature varies in fine tuning the external temperature changes. If there are too many temperature fluctuations, however, experience stress in fish and become susceptible to disease or die. To avoid this, when you buying aquarium fish…"Best aquarium fish tank heater buying guide"