Rodinal - Minimum Concentrate Amount?

I've just starting using Rodinal 1+50 with Delta 100 in both 35mm and 120. Is there a minimum amount of concentrate required? For the 120 I mix 9ml. with 450ml. water and this fills my 16oz. tank. But if I want to mix approximately 8oz. of solution for 35mm./36 exposure will 4 to 4 1/2ml. of Rodinal be enough? Thanks for your responses.

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