Ph is not dropping??
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Old 12-14-2013, 10:53 PM   #1
Dedickjr
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Ph is not dropping??


I am trying to understand why my ph is not dropping. After I added more plants and driftwood my kh dropped to a 3 and my ph stayed the same at 7.6/7.5. I am adding pressurized co2 at two bubbles a minute and have pearling on many of my plants. I run the co2 an hour before lights come on and shuts off an hour before lights out. Just trying to figure out why it's not dropping since my kh has. I was told kh and ph go hand in hand so if one drops so should the other. Please help me understand this. Am I doing something wrong or am I missing something?
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Old 12-14-2013, 11:31 PM   #2
jeremy va
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How big is the tank? 2xbubbles a minute is not very much...
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Old 12-14-2013, 11:36 PM   #3
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What is your general hardness reading?
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Old 12-14-2013, 11:38 PM   #4
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Typically people measure co2 by bubbles per second if that helps.. I would bump up the co2 to at least 1bps or .5bps.. then see how that goes..

How big is the tank?
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Old 12-14-2013, 11:48 PM   #5
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im guessing you meant 2 bps. whats your diffusion method and how big is your tank?
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Old 12-15-2013, 12:10 AM   #6
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Sorry yes meant 2 bubbles a second. My tank is 150 gallon. I diffuse the co2 threw a glass diffuser that is connected to my power head that cuts the bubbles even more to spread it threw the tank. I haven't measured my gh yet. I always measure the kh and ph to get a co2 reading.
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Old 12-15-2013, 12:16 AM   #7
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you need to add a lot more for a 150 gallon.

i have my 57 gallon tank at 6 bps. my kh is pretty high though.
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Old 12-15-2013, 12:19 AM   #8
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Miso how many are we talking then? I don't want to gas out my fish at the same point.

Miso also like you said your kh is high but mine is only at a 3. That has dropped from an 7-8. That has happened within the last three weeks.

Last edited by Darkblade48; 12-15-2013 at 06:19 AM.. Reason: Please use the edit function for back to back posts to keep threads cleaner
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Old 12-15-2013, 01:25 AM   #9
Aqguy
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Gh7
Kh4
Ph6.6
1 1/2 bbs 75g tall
I found the lower my gh & kh the ph falls faster
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Old 12-15-2013, 01:37 AM   #10
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You can't measure how much CO2 is in the water by measuring pH and KH. That only works if your water contains nothing that affects the pH except carbonates and CO2. Very few of our tanks come close to that. The best way to "measure" the CO2 is to watch the plants and fish. Good CO2 will cause the plants to grow the fastest that the light will let them, sometimes causing pearling of most of the plants. Too much CO2 will cause the fish to show obvious distress, from clustering at the surface seemingly gasping for air, to losing their colors or laying on the substrate. With too little CO2 the plants will not be growing as fast or pearling as much as they should, given the amount of light they have. (This assumes that they are not limited in growth rate by a shortage of N,P,K or trace elements.)

A drop checker is a good way to find out if you are anywhere near the optimum amount of CO2 in the water. If used correctly, it will be green to yellow-green if you are at least in the ballpark on how much CO2 you have.
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Old 12-15-2013, 01:39 AM   #11
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Take a 5 gallon sample of your water put your co2 diffuser into it and see how much it reduces it. If it brings it down under 7.5 then maybe just not injecting enough into your system.


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Old 12-15-2013, 02:45 AM   #12
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Hoppy I do have a co2 checker in the tank and it is a yellowish green so I guess it's where it needs to be then. How often should I change out the solution by chance? It's been in there for about a week right now.
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Old 12-15-2013, 06:20 AM   #13
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Quote:
Originally Posted by Dedickjr View Post
Hoppy I do have a co2 checker in the tank and it is a yellowish green so I guess it's where it needs to be then. How often should I change out the solution by chance? It's been in there for about a week right now.
Just a question; are you using 4 dkH reference solution in your drop checker?

I find it a bit unlikely that you are getting a yellow-green colour with only 2 bubbles per second in a 150 gallon aquarium.
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Old 12-15-2013, 06:22 PM   #14
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Darkblade48. My lfs said since my kh in my tank is at a 3 (tested by myself and the lfs) that I was safe to use my tank water. Are they wrong? If so I guess I'll have to go online and buy some then.
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Old 12-16-2013, 01:13 AM   #15
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Quote:
Originally Posted by Dedickjr View Post
Darkblade48. My lfs said since my kh in my tank is at a 3 (tested by myself and the lfs) that I was safe to use my tank water. Are they wrong? If so I guess I'll have to go online and buy some then.
Yes, this is wrong.

You must use a reference solution where carbonates are the only contributing species to kH.

Most people use a 4 dkH reference solution, as when the solution turns green(ish), it indicates approximately 30 ppm of CO2 in the water column.

You can also make your own drop checker solution, if you want to (do a search on the forums for instructions on how to do so).
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