01-28-2009, 06:48 PM
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whats making your ph unstable is your kh. kh is your buffer, not gh. check your kh and tell us. with carbon injection you need at least 4 degrees more would be better as it makes the ph harder to shift. to increase your kh just add regular housold baking soda. kh is biocarbonate. my tank is below 6.0 as well at which is off the chart from what my AP kit can read. unlike you i don't have fish as of now, just plants. i have co2 driftwood and rocks that is aiding to my problem. coral would be best, you want to leave chemical out of the equation as much as possible.