Mine's just like this and I just filled in the grooves with silicone. We have a couple feet of 11" flex at the bottom controlled by a Helix. There's a light grate on top of the flex, on little feet things, and then bottles of water for the heat sink and then another light grate and then 5 egg boxes. Works well and keeps a steady 89-90F temp for a small monetary investment (the neighbor's cooler!)
Where do you put the probe for the thermostat? Do you use a fan and if no how come? Thank you