Not new to aquariums and plants but new to Co2. - The Planted Tank Forum
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post #1 of 15 (permalink) Old 07-21-2020, 04:46 AM Thread Starter
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Not new to aquariums and plants but new to Co2.

This is probably a no brainer to most but I'm a co2 noob. I have a 6 foot long 125 gallon aquarium. In the back of the aquarium I have the inlet and outlet to a canister filter, in the middle I have a long air stone, and at the other end I have the inlet and outlet to another canister filter. I have read that with co2 to only run the air at night. Do I need it at all? The main question I have is where would it be best to place the diffuser? I'm using a Flux diffuser. Any insight would help. I thank you in advance

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post #2 of 15 (permalink) Old 07-21-2020, 03:56 PM
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Generally you would place the diffuser opposite one of the return outlets so the flow smashes the co2 bubble stream and disperses it. Placing it as low as possible will give the co2 bubbles time to move about the tank. If some go to the surface its not really a problem. If the filter doesn't have enough flow across the 125G to break up the bubbles you could place it under the return and let the outlet carry the co2 across the tank.
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post #3 of 15 (permalink) Old 07-21-2020, 08:53 PM
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For a 6 foot long tank you'll likely need multiple in-tank diffusers throughout the tank to get appropriate CO2 dispersion. I have difficulty getting decent flow across a 20 long (30 inches) with just 1 in-tank diffuser. Alternatively you get an inline diffuser, which honestly I'd suggest, and then as long as you are getting adequate flow from your filter, you'll get good CO2 dispersion evertwhere.

As for the airstone, yeah don't run it while the CO2 is on.
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post #4 of 15 (permalink) Old 07-21-2020, 09:17 PM Thread Starter
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Don't pay attention to the algae bloom and the rocks are one the log temporarily until it stops trying to float. It's hard to see but in each back corner is the filter inlet and outlet. The left filter flows to the right and the right filter flows to the left. I have a notion to put the spray bars on and direct the flow towards the front glass. If you look at the crypt at the right end of the log the log is hollow right there. I thought about putting the diffuser inside the log and letting it bubble out from the log. Any thoughts? I have some more plants coming Thursday to fill up the bare spots and some red to add some color. What's your thoughts? How would you run the co2? Any thoughts or criticism is appreciated. Click image for larger version

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post #5 of 15 (permalink) Old 07-21-2020, 09:26 PM
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Hi there. I have no comment regarding the CO2 and am only reading to learn more about them as well. However, I would like to suggest to soak or even try to boil the driftwood until it becomes waterlogged, so that you won't need the rocks. Boiling it would even help with the tannin. Please disregard if you've already done it, of course.
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post #6 of 15 (permalink) Old 07-21-2020, 09:34 PM Thread Starter
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I was going to get an in line diffuser but I run sun sun canisters and the tubing is 3/4" ID and 1" OD. Too thick for in line diffuser.

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post #7 of 15 (permalink) Old 07-22-2020, 04:38 AM
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You could probably find some reducers to splice in a little section of smaller tubing to fit an inline diffuser if you wanted to go that route.
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post #8 of 15 (permalink) Old 07-22-2020, 12:21 PM
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I run a 125g with co2 and found that an inline diffuser fed into a large DIY reactor, placed in the middle of the tank, works best. But I had to increase the flow of the tank significantly with powerheads and 3 large canister filters.

The other thing I noticed is you’ll want to increase your plant mass by like 300%. Plant heavily from the get go, and add easy fast growing stem plants (which can be removed as you go).
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post #9 of 15 (permalink) Old 07-22-2020, 05:51 PM
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Quote:
Originally Posted by JKNolen View Post
I was going to get an in line diffuser but I run sun sun canisters and the tubing is 3/4" ID and 1" OD. Too thick for in line diffuser.
This would work with your sun sun canisters. I use one on my 75g and it works well.

https://aquariumplants.com/carbondos...-reactor-5000/
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post #10 of 15 (permalink) Old 07-23-2020, 10:31 PM
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I also agree that if you plan on running that much light, get more plants into the tank, something easy and fast growing like Rotala Rotundifolia. I'm also thinking an inline diffuser would be your best option.

I don't have a big home tank, my 20 gallon is running a HOB/Canister with a CO2 line with a piece of Sishkabob skewer inserted and fed up the canister return pipe/deflector a few inches to disperse the CO2 in a turbulent manner into the tank.

It works fairly well but a few bubbles do manage to make the surface. This is more DIY than most folks would want to mess with.
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post #11 of 15 (permalink) Old 07-24-2020, 09:29 PM Thread Starter
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The funny thing is when I was buying stuff for this build I bought two lights with timers and soon found out I only needed one. The light you see, there is an identical one sitting behind it not on. Turn it on. Boy do you have some light!

Hey, should I run one sun sun 304b with an in line diffuser or install a T and run both sun sun 304b with an in line diffuser?

Kent Nolen

Last edited by Darkblade48; 07-25-2020 at 07:50 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #12 of 15 (permalink) Old 07-25-2020, 12:19 PM
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Quote:
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Hey, should I run one sun sun 304b with an in line diffuser or install a T and run both sun sun 304b with an in line diffuser?
One is more than adequate. I know you received alot of different advise. There are many ways to diffuse co2 effectively and your original way with the in-tank diffuser is fine as well. If you already have it, you might as well try it as I described in the my first post. Co2 is cheap so even if it turned out you have to run it a little stronger, it really won't amount to anything.

Some food for thought, all of these tanks in the ADA gallery (including 6 footers) run one in-tank diffuser.

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post #13 of 15 (permalink) Old 08-01-2020, 03:59 PM Thread Starter
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I finally got my delivery from Co2 art. My daughter will get the tank filled and hook it up next week I guess. Is there really a reason to run air at night or does it need it? Your thoughts are appreciated. Thanks again!

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post #14 of 15 (permalink) Old 08-01-2020, 09:01 PM
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No, it's not needed if you are shutting CO2 off at night and may not be necessary even if you run CO2 24/7. You should make sure that you have good surface rippling going on all the time to ensure good gas exchange. The best way to do this is with the filter return or a separate pump or skimmer. Air stones look like they are putting O2 into the water, but they are not as efficient as making sure the waters' surface is full of ripples. I run my CO2 24/7 with no issues.
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post #15 of 15 (permalink) Old 08-02-2020, 03:12 AM Thread Starter
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I know I'm probably driving you crazy with all of the questions. I apologize, it will be set up soon. Okay the tank is 6' I have the inlet to the filters one in each back corner. I will have a spray bar on each end facing each other causing surface tension and hopefully circulating the water through out the tank. What do you think if I put the diffuser dead center of the back wall?

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