[SuperFudge]

Daryll,

Im gonna head out on a limb and disagree with some here.
There is definatly something else wrong, The reactor the size of the one you have will have no problem maintaining alk in a 300g system packed with SPS. Let alone a 120.
Your Reactor is an Alkalinity reactor...i dont even know why they call it a ca reactor.

It is much easier to raise alk with the reactor than it is calcium, they both come out of it in certain ratio`s. Alk being the major portion.

Most systems will see their alk top out long before they reach the calcium they wish to see, using a reactor..as is the case with my system.

My alk gets so high, i have temorarily shut the reactor down.
I will hit an alk of high 4`s meq/l long before a Ca of 400 is hit.
This is why many will also use a calcium additive to try and boost Ca without the added alk, this is why i have to run Kalkwasser aswell.
The reverse is true for Kalk, though it adds both aswell.

-What is the Ph Coming out of the reactor ?
- what is the Ca coming out of the reactor ?
- what is the alk coming out of the reactor ?
- what is your current effluent rate ?
- what is your current bubble count ?
-is the recirc pump on the reactor running ?

You mention fiddling with different rates...are you leaving it 48 hrs before the tank test is done ?
If the alk is low (out of the reactor) and the PH is above 6.5, then the only adjustment needed is more co2.



If we determine a few of these answers, we will find were the problem lies.

Marc.