The Nova Tec IceProbe Aquarium Water Chiller is the ideal cooling solution for small aquariums. This quiet, reliable efficient chiller uses advanced thermoelectric technology to directly convert electricity into cooling power. Can be easily bulkheaded through a 1-1/4". hole into siphon overflows, prefilters, sumps or even directly into plastic aquariums. Just keep in mind: 1) it can only cool 10 gallons of water 6° - 8°F below ambient air temp; 2) it does not work like other chillers—you need to rig it up so the cooling probe is directly in the water.Related Articles:Aquarium Chiller Overview.