Be careful about using a too thin tank for 8x10. The film bows out from the developing hanger frames and can scratch in the middle. If I make new tanks I worry less about tank volume and more about not scratching the film. My plexiglass tanks only hold 700-800 mL for standard Kodak 8x10 hangers. If you mix your own developers they don't cost much compared to the frustration of spoiled films.
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