I'd suggest a 20 gallon tank for ten skirt tetras (which I believe is the species of the glo tetras) and three male guppies. You could probably go with five male guppies if you want. It might help spread out any aggression between them.
3 Male guppies as an addition to the tank, should be okay. It depends on what kind of fish you call glowfish (there are multiple fish species that are glowfish these days) that may nip at other fishes' fins. But there are also guppies with shorter fins. So, take your pick...
I'm not saying it won't happen, but I think it's unlikely with ten of them in the tank. They'll have enough of their own species to hold their attention.
I agree with getting a 20 gallon for that many fish. I have 3 guppies, and they live in a 10 gallon with a betta. The betta doesn't fin nip, but I have seen them on occasion, nip each other. Actually, they are 2 years old. Time flys.
I just received my 3 guppies today by Fed'ex. I'm going to be watching them. My 3 Livebearer's like to pick on my regular tetras. And the Glo-Fish like to pick on their own kind. I have a 20 gallon tank.
My guppies and glo fish.
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