The Planted Tank Forum - View Single Post - Fluval spec V filtration (style)
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Old 01-21-2013, 12:01 PM   #15
ownedbycats
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That hole near the bottom is to keep water flowing to the pump in case the water evaporates too fast and the water line gets below the intake grating on top. Because of the hole in the lid, if you heat the water much warmer than room temperature (our house is cold in winter so water is about 8 degrees warmer than room) water can evaporate really quicky. At least with the little hole at the bottome your pump doesn't run dry and burn out.
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