How much rock in a 29 gallon aquarium?

<h3>How much rock in a 29 gallon aquarium?</h3>

I am building a Malawi cichlid tank and I would like to know how much rock I need to make the optimum amount of caves and hiding spots.
I don't mean gravel, I mean the rocks to stack up so that the fish will have places to hide.


<strong>Malawi best answer:</strong>
<p><i>Answer by flash21</i><br/>1 to 1 and a half pounds per gallon should be enough (:</p>
<p><strong>Flag ~ Malawi</strong>
<img alt="Malawi" src="http://farm4.staticflickr.com/3410/3443230042_7866135edc.jpg" width="400"/><br/>
<i>Image by <a href="http://www.flickr.com/photos/24842486@N07/3443230042">erjkprunczyk</a></i>
Malawi.</p>

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