The 6205's would have a much wider flow pattern due to the wider output, but also a little less reach, a 6105 has a roughly 6.5ft by 2ft pattern. While the 6205 is about 5ft by 3ft.I would go with 2 6205's and possibly add a wavebox.
In terms of GPH the Vortechs do about 3200gph and cover a roughly 4 * 3 area, of course that channels and carried further in a narrower tank. The 6205 will do about 5200gph at full power and cover a 5.5 by 3ft area. The wavebox produces a wave flow which lifts and suspends detritus that the 6205's can then sweep away. The only way the Streams can cancel out the wavebox is if you have the Stream aimed directly into the output of the wavebox.
I would figure on a wave that is 1-1.5" high. I would allow 2" from the top of the tank to the waters surface, the maximum wave height can be adjusted but in general at least 3/4" is needed for a good effect.
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