He'll hopefully stay healthy in that tank. He needs to be by himself or maybe with a platy. There is no room in that tank for more fish because of how much ammonia and wastes he will produce. With more fish the water chemistry will be unstable and possibly kill them. Guppies are also a tropical fish. They need tropical temperatures and prefer a slightly less alkaline water than goldies. You shouldn't mix them. Platies are a tropical fish, but they can thrive in colder temperatures than the average trop. Never put algae eaters with goldfish because it is risking the life of both species. Plecos and other sucker fish can kill slower fancy goldies, and goldies can try to eat the plecos and get them stuck in their throat. You might find people who say they have both species together, but these people are playing a deadly roulette with the fish and they obviously don't care if something happens.
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