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I too suggest you not mix these, and especially in what is a very small space. A group of pygmy gourami would be fine, but without the guppies. I would not confine a dwarf gourami in a 10g. as it is best in a pair/trio which means more space.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]