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joey'd is da man
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I go for about 2-4" but some like more or less, I say enough to plant your plants, but not too much because it will just get dirty.
You can also go for the sand option.
 

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joey'd is da man
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and welcome to the site :
:
(I forgot to say)
 

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well for piranhas it is not important to have excess gravel as you should for cichlids that tend to dig alot. So an inch or two would be adequate
 

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That's a bit of a crude calcaulation...
I mean, coarse gravel will weigh less per handfull (more air between the stones) than a very fine gravel...
 
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