I bought a used Jebao dp-4 on eBay for $40. Had to turn some of the rollers around to get it to work properly (look on YouTube for instructions), but besides that it’s been working fine.
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Red Sea 4 head I was consideringI have the jeboa on a QT and Red Sea on main tank. Love the Red Sea 4 doser and accuracy is excellent and so is the functionality. J