Assuming you want all these fish, you would easily get away with 15 Ghost shrimp, 5 Black Phantom tetra, 1 Dwarf Gourami and 6 Guppy(1Male>2Female ratio, not 6 Males!). You need a good filter. With a 100 GPH
filtration, it will still be under filtered. You would need at least 170gph-200gph, temperatures from 23-27C, pH 6-7.5(They will defiantly adapt). The Black Phantom Tetra will likely try to fin nip Guppy.