Best way to provide CO2 for a large tank. - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 11-19-2016, 08:14 PM Thread Starter
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Best way to provide CO2 for a large tank.

I have a 165g tank and has been running pressurized co2 through a ceramic diffuser. It doesnt seem to provide enough co2. I am guessing that the sump is degassing at a large rate.

I was thinking of making a Rex Grigg reactor but read somewhere that it would be insufficient for larger tanks.

I would like your suggestions. How are people with larger tanks providing co2?


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post #2 of 7 (permalink) Old 11-19-2016, 10:10 PM
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I believe a lot of the people that have large tanks and a sump use either a Griggs or Cerges in a closed loop system. Could be wrong so wait for others that have them to chime in.

Just a noob


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post #3 of 7 (permalink) Old 11-19-2016, 10:40 PM
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I don't have a large tank, but I do have a sump. At first I used a cerges and it did well up to about 7 bps. I recently built a venturi reactor and I'm feeding that hog with 10bps right now and it does awesome. If I were you I would make the tallest one you could possibly handle and feed it with a pump in the sump unless you have a manifold on your returns. The reactor I made is about 28 inches tall and is made out of 2" clear pvc.
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post #4 of 7 (permalink) Old 11-21-2016, 08:30 PM
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For my 155 gallon tank I run two Rena XP3 canister filters through a single 3" diameter Griggs style reactor, 24 inches long filled with bioballs. The two outflows then distribute CO2 to different areas of the tank, and overall flow pattern is circular. I'm getting very good dissolution - just a few tiny bubble escape the reactor, and then filters and two powerheads push these around the tank. I used to use a 2" reactor on each filter return, but it was hard to divide CO2 between them without a dual manifold system. This setup has been running for about six weeks and results have been great so far.
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post #5 of 7 (permalink) Old 11-22-2016, 03:32 AM
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here is my home made reactor for my 230 gallon tank , about 4 feet long , I have a bubble counter inline but can not keep water in it , CO2 is 100% absorbed.
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post #6 of 7 (permalink) Old 11-23-2016, 03:32 PM Thread Starter
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Thanks everyone.. from the replies, looks like a larger diameter 2" or 3" reactor would be the way to do. I'll PM you guys to get more info on your setups. Really appreciate the replies.
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post #7 of 7 (permalink) Old 11-23-2016, 03:43 PM
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i would like to offer a different opinion. I have a 210 gallon, was running cerges reactor on a big water filter housing. Hard to keep co2 stable with sump and open tank. I felt more co2 was gas off. Was running out of co2 within 1-2 months, gets tiring have to refill it often.
Also, plants were growing faster than I would like to maintain.

Now, I'm going really low maintenance with some tall plants like vals, no co2, and some foreground plants.


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