09-02-2009, 02:51 PM
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As stated in the above post you do need to have more females than males. Even if you have the same number of each, the males will chase the females so much that they may die. (I have seen this happen) The males will also start to fight and bite at eachothers tails and fins.
I started out with 4 guppies in a 10 gallon tank and they lived 2+ years if that helps you with the tank size question. Once they started having babies, they soon outgrew that tank so keep that in mind!