Are you doing drip irrigation, watering from below, or hand watering? It'll make a difference in terms of volume req.
You've chosen excellent container varieties.
I've grown C Volkov successfully in 5 gals, 7 gals is plenty for a couple of stems. It tends to be a compact plant.
Silvery FT is a compact plant also, so you could get away with 5 gals easily.
B Triumph I have not grown, but understand it is compact also.
I'm down to about 4 gals for each with pretty decent production.
Don't forget a cal-mag source. Best of luck!
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