Yes, but it's an utterly stupid and irresponsible idea.
Too many Melanotaenia, Pseudomugil, Glossolepis, Chilatherina, etc. are endangered or extinct in the wild already; the crossing of lines-even from the same approximate locality- is heavily frowned upon; crossing species is comparable to a capital offense to many.
Preservation of locales and species in the hobby is crucial for the long-term species maintenance of many rainbowfishes.