GHL Doser 2 and Green Leaf Aquatics C02 Regulator
 

GHL 2 Doser 4 channels and can be controlled using Wi-Fi, works amazing. Shut my reef tank down over a year ago and then used it to dose fertilizer in my planted tank for a few months til I decided to go low tech. $300

Green leaf aquatics supreme co2 regulator $150
http://greenleafaquariums.com/produc...regulator.html

Will deliver to Calgary