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I've read that for big rocks it's a good idea to place them on something like eggcrating to disperse the weight over a larger sureface area of glass. What you don't want is a 60-100lb rock resting on just a couple of square inches of glass.
 

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I doubt Amano's large rocks require extra support.

Remember that reef hobbyists often pile pounds upon pounds of live rocks in their tanks, and they seem to have no problem with standard AGA tanks.

Carlos
 

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Reefers use carbonate based rocks of relatively low density and weight. If you use something of igneous origin, like a ferro-magnesium basalt, you are going to be using a very much more hefty, dense rock type. From what I see of Amano Aquaria, I sense from the size alone the tanks have tempered glass bottoms, if not sides, and that heavier rocks are thereby supported. My intuition tells me not to load an AGA 55g down with 200 pounds of dense rock.

Andrew Cribb
 
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