Tanks easily overheat, and your fishes can suffer or even die if their water gets too warm. Aquarium chillers come to the rescue in warm summer months, and offset heat from equipment like pumps and lights. Many fish and organisms come from cold waters, and you'll need an aquarium chiller to replicate these conditions. We carry drop-in chillers and flow-through chillers. Make sure you have a reliable aquarium thermometer to avoid fluctuations.