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Not sure about aragonite in your media bag, but I see crushed coral used this way. I use crushed up limestone in my filter media bags. I had some limestone bases I busted up into fairly small pieces and use that. But the crushed coral would be much easier.
There is no reason to not use aragonite in your media except for how much it will raise your PH. Its perfectly safe. Maybe Google the PH of both substances and see?
I am using aragonite as my substrate and it is doing the job. I do water changes with soft water and do not buffer or add anything to it. No apparent problems so far and none expected. But the PH does come down a little at water changes.
 

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Ok…thanx a lot…can i knw hw much ur ph is just because of the aragonite sand since you dont add anything else for the ph?…
When I started the tank with aragonite substrate my reading was about 8.2. It dropped to about 8.0 after a 50% water change. I must admit I have not done much water testing as things are going so well. I should though as my tap water is quite soft.
With the combination of the crushed up limestone in both filter media bags in another (40) tank with pool sand I had reading around 8.0 which is quite good due to my soft tap water. My Mbuna tank has aragonite substrate and both HOB's have limestone in them.
This thread has me thinking to do some testing today. I have the 40 gallon that has no fish. So I need to know. I also may have to dose some ammonia as there is nothing for the BB to feed on. It was fully cycled when I moved the fish out.
I have been transferring the water from the Mbuna tank to the empty (40) tank at water changes. Then adding fresh water to the Mbuna tank.
I tested the water at the store where I bought my yellow labs and it was 7.5. They were very healthy and beautiful. I am thinking they were raised in this water condition. So maybe there were accustomed to this PH?

So I think adding aragonite or crushed coral to your filter media should help considerably. However it will take time to come up. It took 2 weeks for my last tank.
You could also use some limestone in the tank as hardscape. This would work well. Its fairly inexpensive. The bases I had were pure white and quite porous. I added them to a tropical tank once and had to remove them the next day. The PH shot up real quick and was to high for the fish.
So I assume this may be a good idea for you. Good luck.

@Deeda. I have the API GH/KH test kit and cannot get a reliable reading. I cannot explain as it was a complicated question when I asked it before. But I have found the test kit to be very hard to use and I have not been able to reliably know the results. Almost like the water is out of test parameters even before adding any test solution?
Any other easier test kit for testing GH/KH? I will attempt to use the API kit again that way I can explian what my issue is.
 
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