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No you should not treat an infected goldfish with healthy ones. The infected fish should be separated until it is healthy again and the remaining fish should be checked regally. Any medication you give an infected fish can harm any healthy fish.
The pluralized form of the phrase "newly discovered fish breed" is "newly discovered fish breeds".
Newly hatched sultan fish are born with very small, soft scales. They are also much smaller than adult fish. Despite their small size, newly hatched sultan fish are able to feed themselves.
A newly born or hatched fish is a fry.
Newly hatched insects are generally called crawlers.
alevin
A fry
A Baby Fish is called a Fry, a fingerling, or a guppy.
It should make the fish in the same tank age faster, and maybe keep them healthy.
I think fish is cooked the most healthy when it's steamed cooked.
Fry [1913 Webster] Alevin
alevin