Join Date: Aug 2009
Location: Walnut Creek, CA
Have very soft tap water with high pH and need help trying to stabilize gH and kH
Like the title says, I have tap water that reads a gH and kH of 1 degree with the API test. I also read a pH of 8-8.2 out of the tap. I setup amazonia ii in an established tank about 10 days ago and have been doing a lot of water changes to get the ammonia out, it's down below .25 currently. However, my pH was below 6.0 and my gH and kH were at 0 in the tank. When I add baking soda or Kent Marine R/O right at the recommended amounts to change the two parameters to 4 degrees they never stay the same and will drop down to 1 degree in about 24 hours. At that point I am nervous just adding more, should I be adding more until the levels stay at 3-4 degrees or will that cause too high a TDS?
The only reason I care about GH is because I am using it to measure magnesium and calcium concentrations available for the plants as I have a few with slowly browning leaves that aren't recovering.
I want kH to be at least 4degrees so that when I do a 13% water change my high pH tap water doesn't cause large swings.
Is the amazonia ii the reason I can't keep a stable gh/kh? I know it is supposed to soften water but I didn't expect it to be this severe. What do you think about adding crushed coral in this situation to sustain a gh/kh level of around 4-5 degrees? I'd like my pH to stay between 6-7.
As for details about the tank, it's a 37 gallon with a 65watt power compact, no CO2 injection, daily 3ml flourish excel dose in the morning. I have brighty K as well but was told to wait until the 3rd week to begin dosing, should I start dosing that now?
I had a lot of questions there, so thank you for answering what you can.