06-22-2011, 07:50 PM
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I agree with the others and also suggest keeping the heater on. I do think they need one, not only to avoid sudden/dramatic temp. fluctuations, but to create humidity between the water surface & tank lid, which Anabantoid fish benefit from, they can catch chills and dry air can damage the labyrinth organ (but this may be moreso in fry when the organ is developing).