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I just use an Aqua medic dosing pump, they run 88$ but work great to the ml. They can have any sized reservior so I only refill once every month or so.

You can adjust the solution concentration to match your desired levels in the tank/dosing etc and use a number of DIY devices I've seen.
Timer based ideas work well, there are many designs that will pinch a silicone tubing line and allow on/off from 15 min up to 12 hours etc.

Tom Barr
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