Works great! Keeps the tank straight at 74Β°. Heater manufacturers claim that they are fully submersible. Well the last heater I had had to be thrown out because it was full of water. There were no cracks in the glass, only water seeped through the top. I no longer submerge my heaters. I keep the plastic lid away from water. So far, so good. No problems, heats up great.
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