Hello. Finally got my tank up and running, it’s been about 3 months now. 47G acrylic with 1” of Onyx Sand under 1” of Flourite Black Sand. Multiple pieces of Seiryu and Ohko Stone. A good size hunk of Mopani driftwood and a piece of regular driftwood. Running a Marineland Emperor 400 HOB with sponge pre-filter, bio-balls and sponge in compartments. A Fluval 206 canister with Sponge pre-filter and ChemiPure Green. Injecting CO2 via a Sera CO2 reactor. Using a Current USA Satellite Plus Pro for lighting. I have an auto doser adding a general fertilizer (Easy Green), an Iron Fertilizer (Easy Iron) and a Carbon Fertilizer (Easy Carbon).
I have multiple different plants including dwarf baby tears. All plants are doing wonderful. My CO2 drop checker is a consistent lime green. All my livestock appear happy and healthy.
My issue is...my KH has vanished. Last measurement (about 6 days ago) I had a dGH - 7
dKH - 4
(Now, I should say that I have been injecting CO2 these last 7 days and I’m sure that’s what’s probably causing this...but I’m not THAT sure)
So today I checked my parameters and my dGH went up to 9
dKH dropped to about 1 or less.
Onyx sand says it’s supposed to support proper KH levels...but I’m guessing that must just be sales pitch.
Anyway, Ammonia & Nitrite are zero... Nitrate is negligible. pH is running about 6.5.
Why has my KH vanished? Is it the CO2?
I use RO water that I remineralize with KHCO3, CASO4 & MGSO4. I set the values of that water @ 8 dGH and 4 dKH.
Am I freaking out over nothing?
I get that everything is doing well, so why mess with it...but it bugs the snot out of me that the KH is so low.
Any suggestions? Maybe a little crushed coral in my HOB?
Any advice would be appreciated