if you are looking for an inexpensive way to dose you can use an aqua lifter on a timer with air line tubing and a milk jug. i have been using milk jugs and aqua lifters for a while now with no problems. just set the timer (it has to have a 1 minute resolution or less) for the desired amount of doses (ex 5 1min doses over 24hrs) and do some test runs to figure out how much would be dosed.
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