Help with co2 and ph controller. - The Planted Tank Forum
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post #1 of 3 (permalink) Old 06-21-2014, 05:30 PM Thread Starter
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Help with co2 and ph controller.

Hello. Well I finally decided to go with a co2 system on my 55 gal planted tank. Purchased a Choice regulator from Green Leaf Aquariums , after weeks of reading and investigating different regulators.
I also bought a Milwaukee MC122 ph controller.
I am still just a little confused with the c02/ph relationship. I know adding co2 will slowly drop my ph to a certain point. I also know the ph controller will help keep my ph at a set point . At what PPM PH do I need to set the ph controller.
My aquarium:
1. 55 gallon tank
2. T5HO with 1 54 watt 6700k daylight bulb and 1 650nm rosate bulb. The fixture sits 21 inches above the substrate. 3 inches ecocomplete
3. one aqua clear 70 hob filter and one aqua clear 110 hob filter.
4. Currently dosing Excell , Potassium , Iron , Phosphorous , nitrogen , comprehensive , root tabs.. All seachem products dosed as recommended on the bottle.

Plants are doing great , just not growing like I want them to , hense the co2/ph controller setup.

Any suggestions PLEASE as I am still fairly new to the planted thing. Again , at what PPM ph should I set the controller.

Last edited by rick dale; 06-21-2014 at 05:32 PM. Reason: add
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post #2 of 3 (permalink) Old 06-21-2014, 06:44 PM
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it depends on your KH. as per the books, we should aim for 30 ppm. so from the table, you will know what ph to have based on your KH. that is assuming you dont have any buffers or driftwood affecting the chemistry of the water.
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post #3 of 3 (permalink) Old 06-21-2014, 07:45 PM
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Fish in? Have to be a bit more careful so find the point at which the controller turns the CO2 on. This should be just a touch lower than your PH without CO2. Say tank is 7.8, maybe set the controller to run it down to 7.6. After a few days or a week, if the fish show no unusual action, you can run it down to a couple tenths lower. Continue this process of letting the fish adapt until you get down to about a full 1.0 lower than the tank without CO2. In theory this will give you the recommended 30PPM. Depending on fish, you may have to stop and give them more time to adjust or some will still not let you go that low. WATCH the fish.
NO FISH? start it near a full 1.0 below the normal PH. You may/ may not want to adjust it a bit from there.
I find the Chart to give me totally useless info. With my readings on PH and GH/KH it tells me I'm at a bout 65 PPM and I'm pretty sure that kills my fish. Since the fish still live I have to assume there are other things in my water which the chart doesn't figure into the numbers.
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