Every tank I've had has had low dKH since I started adding clams into my systems. I am almost positive it is clam related based on all the data I've collected on my parameters.
I think my last dKH reading was 5, or 6. When I hit the sweet spot, which is 8, things just take off with growth.
My Ca. levels are fine (usually about 400-440), its just the dKH gets sucked up so quickly in my system that my reactor couldn't previously meed the dKH demand. I'm hoping that the new Ca. reactor will help balance everything properly.
I've never found supplementing my WC water to have any better benefit vs. non-supplemented water. What happens if you don't mix in the additional Ca and you do a WC?
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