I know it's a joke but the last thing you want to cheap out on is a doser. Google and you'll find the horror stories.Business Idea: Start a company called Balling on a Budget and sell low cost dosing equipment.
*nerdy aquarium joke*
Firmware failing, causing an entire container of Alk to be dosed into the tank overnight while you dream sweet dreams of colorful acros but wake up to a living nightmare.