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I would watch the tetras for possible fin nipping, they can be a bit aggressive towards the guppies.
One thing about the fancy guppies you can get by w/ a litte more than the inch per gallon rule with fancy guppies, so you can overstock your tank a little with just guppies. (if you keep it w/ just males so no possible mulitiplication factor there). They will have a good long swimming space, I would say you could get by with up to 12 guppies in that tank. I wouldn't stock all at once, but that gives you an idea of being able to have a larger amt of fish in that tank.
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