I just bought some cheap motors and heads on eBay $15 each. There DC motors so you can adjust the dosing speed with a variable voltage power supply.. Seem OK but you never know they might be crap. I'm going to wire them up and I'll let you know how it goes if your still looking =). All you need is a project box from radio Shack( $4) and a cord (dollar store) .
I am gonna carbon dose vinegar with them on both my tanks. I'm able to track somewhat if they are working with a graph on the reef angel so I can monitor the pH drop for a while to make sure they are functioning without having to physically look at them. Well at least in theory lol.
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