All of your adult Goldfish including the female Oranda, the male Comets, and your other male Goldfish are all the same species, Carassius auratus. Click here to read more about Goldfish.

This is similar to the situation with the dogs in my neighborhood. They vary a lot in size, shape, and size, and it is difficult to guess what their babies might look like, but they are all the same species.

I would guess that some of your baby Goldfish may grow up to be what goldfish farmers call nymphs. These are Goldfish with large round bodies and vertically lobed tails like the comets. But you will probably get other interesting shapes too.

I'd like to comment on why I think your Goldfish spawned in your aquarium. First 6 mature Goldfish in a 55-gallon aquarium, means each Goldfish has about 9 gallons of water. That is not really crowded.

Second, when you moved the aquarium from your friend's home, you probably didn't keep all the old water, and instead you added some fresh water to top up the aquarium, after you moved it.

Goldfish will often spawn after getting some fresh water. Changing water is a very good way to stimulate most but not all species of fish to spawn. Click here to read more about changing water.

You mentioned that you have been taking really good care of your fish, and that probably also contributed to your success in spawning them. When fish spawn, it is usually proof that they have been getting the good care that they need. If the care is poor,  most types of fish will not spawn.

You also mentioned that, "The males all have the small white bumps on their gills ...", and these small white bumps appear on the males just before they spawn. I'm glad you mentioned seeing the bumps.

Thanks, Jonas, for your interesting comments.