Agree, we need to know the tank size. But assuming it is not 4 feet in length or larger, I would not add the Gold.
The Gold and Blue Gourami are actually the same species, Trichopodus trichopterus [may still be seen under the former genus Trigogaster]. There are several variants, including Blue, Gold, Three-Spot, Cosby, and Opaline. All these are the same fish in different colour patterns.
Males are territorial, sometimes very much. A male and 2-3 females is the best for this species. Males have been known to kill other males. This applies to many species of gourami, to varying degrees, so mixing species is also a risk depending upon the species and the tank size.
And as the previous member said, Silver Dollars are a shoaling fish needing a group. But before increasing them, be careful; they eat plants, they get large (6 inches), and they may not like the gourami and vice-versa.
Byron.