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To determine how many gallons of seawater will be displaced when 200 pounds of live rock is submerged, you would first need to know the rock's density. Generally, live rock has a density of about 0.5 to 0.8 grams per cubic centimeter. Assuming an average density of 0.6 g/cm³, 200 pounds (approximately 90.7 kg) of live rock would displace about 30 gallons of water. Therefore, when submerged, around 30 gallons of seawater will be displaced from the 135-gallon reef tank.

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1w ago

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