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I have a 30 gal and a 5 gal and I notice both tanks have cold spots in them.. They both have sponge filters but i went to plant a new plant in my 30 gal and noticed the spots directly around the heater are warm.. the thermometer reads 80 but there are spots that are just freezing too! how could I circulate betta tanks without creating to much. I thought of putting a bubbler under the themometer but when i doo I see the poor betta struggling to swim. My 30 gal has a mariland for up to 30 gals. My 5 gal has a preset for 10 gal and still is having cold spots


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