I am using a wine fridge for mine. I use 4 inch heat tape starting about a 1/3 of the way down across the bottom and back up the other side and end it even with the other side. If you move the probe down it will make the top hotter. I would rather incubate at 88 than 91 or 92. I would look more at the heat. Oh and my fan is up top blowing down.
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