redfishbluefish
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My Tank Thread
That is about as cost effective as it gets. Has it been working well for you?
I have no complaints...been doing it forever....I'll guess, 15 years. Cost less than five bucks a year to dose a 90 gallons DT. I use Preston Driveway Heat/SWI Winter Heat for the calcium and Arm & Hammer Baking Soda from Sam's Club for the Alk part. Corals grow like weeds.
I talk about it here in this thread: