The phrase "a sixth stream of" is correct and usable in written English.
It can be used when referring to an additional category or type within a series of streams, such as in discussions about music, art, or other classifications.
Example: "In recent years, researchers have identified a sixth stream of consciousness that challenges traditional theories."
Alternatives: "an additional stream of" or "a new category of".
A third stream of migrants harvests vegetables from southern California northward through the Pacific Coast states.
But a second stream of intelligence information apparently reviewed late Friday ratcheted up the level of concern.
A second stream of water runs over the disk, and that cool water is used to chill the refrigerator.
In the jet ejector pump, fluid passes through a venturi nozzle (see venturi tube) and develops a suction that causes a second stream of fluid to be entrained.
After years of inactivity, the Cathedral Church of St. John the Divine is completing a lease agreement to bring a second residential tower — and a second stream of revenue — to its verdant 11-acre campus and famously unfinished cathedral.
The intention is to build a plant that cooks coal into a gas, developing a pure stream of hydrogen that would be burned to make power, and a second stream of carbon dioxide, the main gas implicated in global warming.
Then again, Mr. Diller acknowledged, he made a speech to the National Association of Broadcasters in the early 1990s in which he said that a second stream of income beyond advertising — retransmission fees — was critical to the survival of free broadcasting.
On the positive side, the Times has enlarged its film coverage, and, at The New Yorker, Richard Brody has added a third stream of criticism and commentary to our coverage on his blog.
The opposing cults of Furtwängler adoration and vilification have persisted to this day, but there is undoubtedly also a third stream of younger listeners for whom he is simply another forgotten German musician with a difficult last name.
