I don't dose, but I intend to. Never enough money to do everything I want to
I saw someone was using cereal boxes from ASDA. Cheap as chips :cool:
I've no clue about the size of containers used, but I know @i-CONICA
doses, so could help you there (when he's recovered from his work party hangover).
I see a lot of people using there smallish containers, so suspect that's enough for most tanks. If you try it with cereal boxes, you've not invested much, so could always swap them out for bigger ones, or upgrade to something custom built once you know what you want.