I tried 2 of these little heaters. They didn't hold up well at the bottom of the bowl and would destroy the gravel if the string got tangled. And they gave no heat. No one. I have a tiny half gallon bowl and for several hours without the heaters there wasn't even the slightest change in temperature. Neither the "fits well in the bowl" feature nor the actual main function of this thing worked. Don't buy this. Your fish stays cold.
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