Proper Bubbles per minute? - The Planted Tank Forum
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post #1 of 10 (permalink) Old 11-16-2002, 10:53 PM Thread Starter
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What is the proper B.P.M. for a 55g tank?......FINALLY got my CO2 working the right way just now need to know the better BPM for the tank itself....thanks

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post #2 of 10 (permalink) Old 11-16-2002, 11:52 PM
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Its kinda trial and error but a good starting point for a 55 is a buuble per 2-3 seconds. Check your kh and ph and use the "chart" to determine your CO2 levels. Get a kh and ph reading before adding co2 and write it down. Then fire up your co2 and take readings every 3-4 hours to see how its affecting your ph. Your kh should remain relatively stable but check it anyways. Then take the ph and kh reading and compare it to the chart. You want co2 levels to be 15-30 ppm. If co2 levels are climbing quick, back off the bubble rate. If after 24 hours your ph hasn't dropped by at least .2, then crank it up. Keep in mind that your ph will drop when the lights are out because the plants don't use co2 at night. tweak.tweak, tweak, till you get it right.
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post #3 of 10 (permalink) Old 11-17-2002, 01:02 AM
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This is helpful information since I am about to get a pressurized CO2 system myself, and am going to do it on a 55 gal!


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post #4 of 10 (permalink) Old 11-20-2002, 03:23 PM
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I hear what you're saying but you have to remember it depends on many things. How many fish will be ib the tank and how big? How many plants will be in the tank, what kinds, how big? How much light will be on the tank and for how long? Every tank will be different so you tweak, tweak, tweak! M.Lemays suggestion is a good place to start, from there you start tweaking. :hehe:

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post #5 of 10 (permalink) Old 02-08-2003, 05:02 PM
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i have 125 gal w/4.2 wats and i dump as much co2 into it as it will take i can`t count it comes out so fast my ph 6.8 kh 5 co2 23.77 ppm and i dose i must have atleast 30 to 35 plants
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post #6 of 10 (permalink) Old 02-09-2003, 06:11 AM
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Mr. Lemay, I think you meant to say rise instead of fall -right?At least thats what I get during the night at shutoff.Although my bubble rate is 1 per second for a 15gal.This gives me a Ph of 6.7 with a Kh of 4 deg .

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post #7 of 10 (permalink) Old 02-09-2003, 03:53 PM
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If the CO2 is on 24 hours a day, the pH will _drop_ during the night, since plants don't use CO2 then... If you shut the CO2 off at night, then you may very well see a rise though...


Tank in transition! 55 gallons, hard water.
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post #8 of 10 (permalink) Old 02-09-2003, 08:02 PM
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Thanks Tim, for clearing that up!!! My statement is correct if CO2 output remains constant day and night.
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post #9 of 10 (permalink) Old 02-10-2003, 06:30 AM
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How much bubbles per second is efficient and safe for a 20g long tank? My other question is I am using a DIY 2L pop bottle Co2 maker right now and if i wanted to regulate the Co2 how would i go about in doing that?

Any help would be great because im am just starting to add Co2 in my tank and im worried about the affects that Co2 has on ph and kh.

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post #10 of 10 (permalink) Old 02-10-2003, 11:59 PM
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Well if your kH is over 3 I don't think you have to worry about DIY CO2 causing a problem. There is no hard and fast answer about how many bubbles per second/minute/hour/day are good for any tank. It's something you have to play with yourself. And since DIY normally gives rates in the bubbles per minute area it's not a problem. Check your pH and kH and look at the CO2 charts and see where you are at. It's very hard to regulate the production of CO2 with a DIY system. It's pretty much either on or off.
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