Baensch vol. 6 shows P. simulans in what they call a "pepper and salt" morph (from Rio Negro), with black speckles over the normal colouration. There is also a var. with a silvery (rather than blue-green) stripe. The so-called platinum cardinal tetras are regarded as a colour mutation with no impact on lifespan or health. The "platinum" green neons should be similar.
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