I would like to revisit the Onyx Buffering issue.
I currently Set up a New 90Gallon FW tank, 7 months in the making. Carefully chose my Rocks, and Wood.
Kept with the same Substrate base of Fluorite, but added Onyx Sand for a Lagoon Type center view for HC and Baby tears, and Clover.
I use RO/DI Water 50% weekly water changes. The RO/DI water in the vat is At a GH of 2 and a KH of 4
After two Days in the tank my water is at A GH of 12 KH of 4. My 55 holds steady at 4 and 4 Respectively, the only thing different between the two tanks are the Onyx Sand.
It seems no matter what i do I can not keep the water Softer in the 90, Its easy enough to buffer the 55 to what I need, at 8dKh but this 90 is costing me endless hrs of headaches
Am I overlooking Something Here??
As of this morning my parameters were:
FE .1 cant seem to get the iron content up in the water coulum as well either
Ph 6.6 looking for 6.2 nominal
Temp 25.8c 78.4f nominal setting of 26.3c when the lights are on
Guess i am going to have to do bi weekly water changes to keep everything stable, My Fauna seem to be ok with it for now, but I see problems that may arise down the road with me having to replace Co2 cylinders every 6 months.
Running at least 6bps to hold 6.4 during the mid afternoon Photo period, I utilize a power vortex reactor to supply the Co2. thats located 2" from the bottom of the tank.
Somehow I believe that the Hardness is being effected by the Onyx, Maybe you can shed some light on these findings I have seen.
My Main goal is to get the Ph stabilized down to 6.2. Not a chemist here as you can see, but i believe the hardness has a lot to do with the breakdown of the Co2 Not???
Thanks for any help you can shed on this.