I'm curious as to how and why the guppies are going to be displayed at your wedding.
If you want flash I would go for 10 males of the same colour and make sure that the bottom and back of the tank are a contrasting colour, i.e. red guppies and black substrate/backing. Four females to one male would be a good ratio if the objective is to produce lots of babies over the next few months.
Good luck!
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