Planted Tank Enthusiast
Join Date: Oct 2005
Location: Maple Grove, MN
KH goes UP when I add CO2
Over the past week I have observed a strange thing.. when I add CO2 my water's KH goes UP.
Using Aquarium Pharmaceuticals KH test kit: Out of the tap it's 20 dKH (!!!). A day after I start injecting CO2 it's up to 24. Today (after about 5 days of injecting CO2) it's up to 29!!!!
My pH is at or around 7.2 to 7.4 which means I have around 60 ppm of CO2, and that figures because my tetras were all up at the surface of the water earlier today.
I was injecting CO2 at around 1 bubble per second. Backed it off to 1 bubble every 2 seconds or so.
Please help me figure out what the hell is going on.
Update: A reply on APD says that CO2 can cause KH to go up. I hadn't heard that one before.
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FILSTAR Advocate #39
Member, Minnesota Aquarium Society
29 Gal. - 100% Eco-Complete/2x65W CF/CO2/Filstar XP2/RedSea500/KH:3/GH:5/pH:< 5.5/EI Dosing/WWC 50%
Last edited by banderbe; 02-04-2006 at 09:06 PM.