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Death is fair to everyone.
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I am pretty sure the rocks would reflect the heat back at it and shut the heater off. Keeping it from properly heating your tank to correct temps.
 

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im planning on creating my own overflow cover. its just going to be a black acrylic sheet thats going to be place on the corner of the tank or in the middle in a rectangular cover. this is for my 10g. and the it will also have the airstone in there to hide it. or just place a dense covering of plants in front of it.

*no actually pumps or whatever. just the cover
 
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