Marty
Randy's method and your method are very different. He is using the ph controller to control the pH inside a calcium reactor whereas you are using a ph controller to minimize the pH drop in your display tank.
I wouldn't be too concerned about the pH in the tank. 7.8 isn't really bad at all as this is quite normal for many reefers that do not does kalk. Use kalk to raise the pH in your display tank via a kalk reactor on an auto topoff.
I would use the pH controller to control the pH inside the reactor only. As more effluent exits your calcium reactor, it will buffer the system and prevent it from going any lower than 7.6.
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