Going the reactor route again -- bubbles - The Planted Tank Forum
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post #1 of 6 (permalink) Old 01-02-2018, 02:53 PM Thread Starter
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Going the reactor route again -- bubbles

If there is one thing I dislike with a passion, it is noisy tanks. For whatever reason I really enjoy absolute silence when it comes to a nice looking tank, noise distracts me from an otherwise great looking setup, be it mine or someone else's.

With that said, I am going the CO2 reactor route again on my next setup, so let me know if I'm on the right track, or overthinking the issue.

(a little bit of bubbling noise is fine, I'm not expecting absolute silence here)

If there is a large bubble of trapped gas in the reactor at the end of the photo period this is essentially "wasted" CO2 as it will slowly be dissolved over the night, not be used by plants, and pose a slight risk, much the same as leaving CO2 on throughout the night.

To fix/solve this should I:

Find a rate of CO2 that does not allow a large bubble to form? (if I experiment and find the rate at which I can diffuse CO2 into the water, maintain that rate throughout the day, I should be able to reach target levels? or would this not allow me to reach target levels?)

OR:

Run CO2 at a higher rate, allow more gas to interact with the water flow, but have it shut off much earlier so as to diffuse the gas bubble over the remaining photo period, resulting in a small amount left (if any at all) in the reactor as the photo period ends.

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post #2 of 6 (permalink) Old 01-02-2018, 05:15 PM
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Hi @Quagulator,

Have you thought about adding a venturi loop to a typical Grigg reactor (Cerges or water softener reactor) to suck excess CO2 gas that accumulates at the top of the reactor back to the hose on the input side of the reactor?

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75 Gallon, 2X55W AH Supply CF 8800K, 1X 59W Fluval Plant (3.0); 45 Gallon Tall, 1X 46W Fluval Plant (3.0); 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 & (Calcined) Montmorillonite Clay
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post #3 of 6 (permalink) Old 01-02-2018, 05:35 PM Thread Starter
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Originally Posted by Seattle_Aquarist View Post
Hi @Quagulator,



Have you thought about adding a venturi loop to a typical Grigg reactor (Cerges or water softener reactor) to suck excess CO2 gas that accumulates at the top of the reactor back to the hose on the input side of the reactor?


No, I have not. Iíll have to do some digging and see what that involves. The reactor I built is just a simple one: 1.5Ē tube, input at the top, output at the bottom, CO2 fed into the side about 3/4 the way up.

This style has worked for me in the past, I donít have it set up atm, likely will by weeks end. I just canít recall (my mind works too fast, or I like to think it does anyway ) if it was noisy when I was running one, or if it was mostly the filter (25 year old marineland magnum canister, which was always trapping bubbles).


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post #4 of 6 (permalink) Old 01-03-2018, 03:48 PM
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With that size / type reactor you would just need a filter wirh lower flow. I have the same setup (I think might be 2") only 75 with a 2215 as biological and to feed the reactor an s i have no noise and no bubbles. Stick around that gph. You can always add media to slow the flow. I have a larger reactor on another 75 gallon. Maybe 2.5" tubing and I'm running a 304B with mechanical and biological and I have no gurgling or bubbles whatsoever.

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post #5 of 6 (permalink) Old 01-03-2018, 03:56 PM Thread Starter
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With that size / type reactor you would just need a filter wirh lower flow. I have the same setup (I think might be 2") only 75 with a 2215 as biological and to feed the reactor an s i have no noise and no bubbles. Stick around that gph. You can always add media to slow the flow. I have a larger reactor on another 75 gallon. Maybe 2.5" tubing and I'm running a 304B with mechanical and biological and I have no gurgling or bubbles whatsoever.


Iíll give it a try, my hopes are the noise isnít a big issue.

I should aim to avoid trapped gas I assume? (A large bubble that is).

I can go off my drop checker as there wonít be any stock right away, so I canít gas anything them to death.


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post #6 of 6 (permalink) Old 01-03-2018, 04:48 PM
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I'm sure there is some relationship between bps and flow. I think I'm at 2bps.. keeps the drop checker lime green in a 75. As long as flow is reasonable and injection rate is reasonable... you may need to find a balance, but with these lower flowing filters I never have any noise and very rarely have bubbles come through. I have my C02 set to come on 1 hour before lights on, one after after lights on I have a 4 hour high light period. Then another 6 hours of very low light. C02 doesn't turn off until 3 hours after the high light period is over.

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