You have a couple problems here with these species. First, they cannot be housed together unless it is in an enormous tank, meaning 6+ feet in length. Male gourami are very territorial, depending upon species (some are more, some less territorial). You have two species that are about the worst.
The Gold Gourami is the species Trichopodus trichopterus. There are several varieties under different common names, such as Gold, Blue, Three-Spot, Opaline, and some others, but it is the same species so they behave the same. Males are very territorial, and I have seen reports from more than one other member mentioning the females being aggressive too. This can be the only gourami species in the tank, and you will need to monitor for aggressiveness to other fish species too which often occurs, especially from males.
The Kissing Gourami is the species Helostoma temminkii, which also has varieties of which the pink is one. This is a fairly aggressive species to begin with (the "kissing" is an aggressive behaviour, jaw-locking, which is common in many cichlids) and as it attains 12 inches (30 cm) it needs a lot of space, and again with no other gourami species. The extendable mouthparts with teeth are designed to rasp algae from rocks, but this weapon also comes in handy to assert itself. The jaw-locking between fish may often lead to jaw damage, and fish with jaw damage may be unable to eat; if persistent, one of the fish usually dies after a few weeks. This aggressive behaviour is not only related to breeding and male territory, but also occurs to defend feeding areas. The fish may also decide to take out this aggression on other species in the aquarium.
I would frankly re-home all these gourami. The Kissing should be kept in small groups of the species to confine the aggressive behaviour to the species and with several fish to spread it out, but this means an even larger tank than 6 feet given the size of these fish. They will eat smaller fish.
Byron.
