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post #1 of 6 (permalink) Old 11-30-2011, 11:19 PM Thread Starter
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ph/co2?

the other day i got a ph controller and hooked it up to my tank....my ph reading on the meter stays at 6.0-6.1...and the shutoff for the co2 is set at 6.5...it seem to never let the co2 come on...is it safe to go below 6.0 with fish and discus in the tank?...or does the 6.0 mean its getting co2 from elsewhere?
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post #2 of 6 (permalink) Old 12-01-2011, 12:40 AM
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Did you calibrate your ph controller?


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post #3 of 6 (permalink) Old 12-01-2011, 12:57 AM Thread Starter
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yes...7.0...excactly...that what has me stumped...i also have peat moss and these special plant trays from my local fish store in it...it stays in the range of 6.0-6.3....
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post #4 of 6 (permalink) Old 12-01-2011, 02:29 AM
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not knowing if anything I say will help but trying.
When I calibrate my pH controller I have to use at least two reference standards 4-7 or 4-10 and having bought Qt bottles from a lab supply I use 4-7-10 having them here (knda PITA). 4-7 is fine I'm sure.
pH is nonlinear so the slope of the resulting reading is set using a 2 standard minimum on my American Marine controllers then I adjust set points. 4 adjustment screws on the box.
I've had my pH as low as 5.8 without bothering the fish I keep but bacteria isn't real active that low.


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post #5 of 6 (permalink) Old 12-01-2011, 04:15 PM
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What lighting does the tank get? That determines how much of everything else you need.

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post #6 of 6 (permalink) Old 12-01-2011, 05:27 PM
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finchflex -

Get some tank water and put it on a small dish bowl and let it sit for 48 hours.
Then get the pH reading of that water that has been sitting and degassing CO2. This will let you know what your tank water's pH when the CO2 levels are at minimum -- a baseline of sorts.

Depending on your lighting, a good start would be to set your pH controller to a full pH point below the "baseline" you recorded. So let's say your de-gassed tank water is still reading 6.3, then set your pH controller to 5.3 (if it gets that low), but WATCH your tank inhabitants the entire time.

I'm thinking your peat moss is bringing your pH down a LOT on its own.

A while back, my tank water was at 7.6 when de-gassed. I had my pH controller set to 6.0, as I was derping around with very high lighting during that time.

Now that my tap water has gone down in pH (probably less treatments this time of the year?), my tank water is at 7.0. Since my lighting is also reduced now, I have my pH controller set to 5.8. No problems with my CRS, RCS, amanos, dwarf pencils, and dwarf rainbows.
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